What does pericoloso mean in Italian? It usually means “dangerous” in English. It is an Italian adjective used when a person, animal, place, activity, object, or situation could cause harm or create a serious risk. You may see pericoloso on warning signs, hear it in everyday conversation, or encounter it while reading Italian news, travel information, or safety instructions. The interesting part is that pericoloso does not always stay in this exact form.
Understanding pericoloso is therefore more useful than simply memorizing “dangerous = pericoloso.” To use the word naturally, you need to know which form agrees with the noun, how the adjective works in a sentence, and when a related word such as rischioso (“risky”) or dannoso (“harmful”) would be more appropriate. You will also encounter expressions such as molto pericoloso (“very dangerous”), troppo pericoloso (“too dangerous”), and può essere pericoloso (“it can be dangerous”).
There is also an important vocabulary distinction between pericoloso and pericolo. The first is an adjective meaning “dangerous,” while the second is a noun meaning “danger” or “hazard.” That small grammatical difference changes how the words behave in a sentence. We will look at their relationship, pronunciation, common phrases, adjective agreement, similar words, and mistakes English speakers often make.
What Does Pericoloso Mean in Italian?
The Italian word pericoloso means “dangerous.” It describes something that presents a possibility of harm, injury, trouble, or other undesirable consequences.
For example:
Quel cane è pericoloso.
That dog is dangerous.
Here, pericoloso describes cane (“dog”), which is masculine singular. That is why the masculine singular form pericoloso is used.
The word can describe many kinds of things:
- una strada pericolosa — a dangerous road
- un animale pericoloso — a dangerous animal
- una situazione pericolosa — a dangerous situation
- un’attività pericolosa — a dangerous activity
- condizioni pericolose — dangerous conditions
Depending on context, the most natural English translation may also be unsafe, hazardous, risky, or harmful. “Dangerous” is the basic translation, but a good translation is always sensitive to context.
Pericoloso at a Glance
| Italian form | English meaning | Gender | Number |
| pericoloso | dangerous | Masculine | Singular |
| pericolosa | dangerous | Feminine | Singular |
| pericolosi | dangerous | Masculine | Plural |
| pericolose | dangerous | Feminine | Plural |
The key lesson is simple: the meaning stays essentially the same, but the ending changes to agree with the noun.
How Do You Pronounce Pericoloso?
A useful pronunciation guide for English speakers is approximately:
peh-ree-koh-LOH-zoh
The stress falls on the “lo” syllable:
pe-ri-co-LÓ-so
Italian pronunciation is more regular than English spelling, so it helps to pronounce each vowel clearly rather than swallowing unstressed sounds.
The word has five syllables:
pe · ri · co · lo · so
The c in co has a hard k sound, similar to the “c” in the English word “cold.” The final o is also pronounced; it should not disappear as an unstressed English ending sometimes does.
Common Pronunciation Mistakes
English speakers may be tempted to pronounce the word according to English pronunciation habits. In particular:
- Do not turn the c into an “s” sound.
- Do not heavily reduce the final vowels.
- Keep the syllables distinct.
- Put the main stress on ló.
You do not need a perfect accent to communicate the word, but learning the natural rhythm will make your Italian easier to understand.
The Four Forms of Pericoloso
One of the most important things to learn is that pericoloso is not the only form of the adjective.
Italian adjectives ending in -o commonly change their endings according to gender and number. Pericoloso follows this regular pattern.
Pericoloso — Masculine Singular
Use pericoloso with a masculine singular noun.
- Un cane pericoloso
- A dangerous dog
Un luogo pericoloso
A dangerous place
Un viaggio pericoloso
A dangerous journey
Pericolosa — Feminine Singular
Use pericolosa with a feminine singular noun.
Una strada pericolosa
A dangerous road
Una situazione pericolosa
A dangerous situation
Un’attività pericolosa
A dangerous activity
Notice that the English adjective remains “dangerous” in every example. Italian changes the ending because the adjective must agree with the noun.
Pericolosi — Masculine Plural
Use pericolosi with masculine plural nouns.
Animali pericolosi
Dangerous animals
Luoghi pericolosi
Dangerous places
Comportamenti pericolosi
Dangerous behaviors
Pericolose — Feminine Plural
Use pericolose with feminine plural nouns.
Strade pericolose
Dangerous roads
Situazioni pericolose
Dangerous situations
Attività pericolose
Dangerous activities
The Agreement Pattern to Remember
| Noun type | Correct form | Example |
| Masculine singular | pericoloso | un animale pericoloso |
| Feminine singular | pericolosa | una strada pericolosa |
| Masculine plural | pericolosi | animali pericolosi |
| Feminine plural | pericolose | strade pericolose |
A helpful memory pattern is:
-o → -a → -i → -e
This is one reason translating Italian word-for-word can be misleading. The English word “dangerous” does not reveal which Italian ending is required.
Expert tip: When choosing between pericoloso and pericolosa, look at the noun, not at the English translation. The noun determines the adjective’s grammatical form.
How to Use Pericoloso in an Italian Sentence
Once you know the forms, the next step is understanding the sentence patterns in which the adjective naturally appears.
Essere + Pericoloso
One of the most common constructions is essere + pericoloso, meaning “to be dangerous.”
Questo posto è pericoloso.
This place is dangerous.
Guidare così è pericoloso.
Driving like this is dangerous.
Il mare è pericoloso oggi.
The sea is dangerous today.
The adjective changes when the subject requires it:
La strada è pericolosa.
The road is dangerous.
Le strade sono pericolose.
The roads are dangerous.
Pericoloso Before a Noun
Italian adjectives can appear before a noun, particularly in ordinary descriptive expressions.
Un pericoloso criminale
A dangerous criminal
Una pericolosa situazione
A dangerous situation
However, adjective placement in Italian is more flexible than in English. The position can depend on the adjective, meaning, emphasis, and style.
Noun + Pericoloso
The adjective can also follow the noun:
Un animale pericoloso
A dangerous animal
Una situazione pericolosa
A dangerous situation
This noun-plus-adjective pattern is extremely common and is often the easiest structure for learners to use.
È pericoloso…
You will frequently hear è pericoloso in warnings and general statements.
È pericoloso nuotare qui.
It is dangerous to swim here.
È pericoloso attraversare la strada qui.
It is dangerous to cross the road here.
The construction is useful because the adjective describes the activity or situation rather than necessarily describing a specific noun.
Common Phrases With Pericoloso
Learning short expressions can be more useful than memorizing isolated vocabulary.
| Italian phrase | Natural English meaning | Typical use |
| è pericoloso | it is dangerous | General warning |
| molto pericoloso | very dangerous | Strong warning |
| troppo pericoloso | too dangerous | Excessive risk |
| non è pericoloso | it isn’t dangerous | Reassurance |
| può essere pericoloso | it can be dangerous | Conditional warning |
| diventa pericoloso | it becomes dangerous | Changing conditions |
| sembra pericoloso | it seems dangerous | Observation or uncertainty |
| pericoloso per i bambini | dangerous for children | Specific risk |
Molto pericoloso — “Very Dangerous”
È molto pericoloso.
It is very dangerous.
If the noun is feminine:
È molto pericolosa.
It is very dangerous.
The adverb molto does not change simply because the adjective does.
Troppo pericoloso — “Too Dangerous”
È troppo pericoloso per i bambini.
It is too dangerous for children.
The structure troppo + adjective expresses an excessive degree.
Può essere pericoloso — “It Can Be Dangerous”
This phrase is especially useful when danger depends on circumstances.
Questo farmaco può essere pericoloso se usato male.
This medicine can be dangerous if used incorrectly.
The phrase does not claim that something is dangerous under every circumstance. That distinction matters in safety-related communication.What Does Pericoloso Mean in Different Contexts?
The basic translation remains “dangerous,” but context affects the most natural English wording.
People and Animals
When pericoloso describes a person or animal, dangerous is usually the straightforward translation.
Quel cane sembra pericoloso.
That dog seems dangerous.
È un uomo pericoloso.
He is a dangerous man.
The word can describe the threat presented by someone’s behavior, not simply their personality.
Roads, Places, and Locations
For places, pericoloso may translate as either dangerous or unsafe.
Questa strada è pericolosa di notte.
This road is dangerous at night.
In a travel context, “unsafe” might sound more natural in English when the concern is general personal safety rather than an immediate physical hazard.
Activities and Behavior
Activities can be described as pericolose when they carry significant risk.
È uno sport pericoloso.
It is a dangerous sport.
Behavior can also be described this way:
È un comportamento pericoloso.
It is dangerous behavior.
Objects, Substances, and Conditions
Technical or safety contexts may favor hazardous rather than “dangerous.”
For example:
Una sostanza pericolosa
A hazardous/dangerous substance
The Italian adjective is broad. English has a larger set of context-specific alternatives, so translators select the word that best communicates the intended risk.
Pericoloso vs. Pericolo: What’s the Difference?
These two words are closely related, but they are not interchangeable.
Pericoloso is an adjective:
La strada è pericolosa.
The road is dangerous.
Pericolo is a noun:
C’è un pericolo.
There is a danger.
This distinction is easy to remember if you compare their English grammatical roles.
| Italian | Part of speech | English | Example |
| pericoloso | Adjective | dangerous | È pericoloso. |
| pericolo | Noun | danger | C’è un pericolo. |
| pericolosa | Adjective | dangerous | Una situazione pericolosa. |
| pericolosi | Adjective | dangerous | Animali pericolosi. |
| pericolose | Adjective | dangerous | Strade pericolose. |
A useful test is to ask: Am I naming the danger, or describing something as dangerous?
- Naming it → pericolo
- Describing something → pericoloso or one of its agreement forms
Pericoloso vs. Similar Italian Words
“Dangerous” is not the only way Italians can express risk. Choosing the right related adjective makes your meaning more precise.
Pericoloso vs. Rischioso
Pericoloso means dangerous.
Rischioso means risky or involving risk.
The distinction is subtle but useful. Something can be rischioso because the outcome is uncertain or carries a possibility of loss, while pericoloso more strongly suggests potential harm or danger.
For example:
È una decisione rischiosa.
It is a risky decision.
This does not necessarily mean the decision could physically hurt someone.
By contrast:
È una situazione pericolosa.
It is a dangerous situation.
The second sentence points more directly toward danger.
Pericoloso vs. Dannoso
Dannoso generally means harmful, damaging, or detrimental.
Il fumo è dannoso per la salute.
Smoking/smoke is harmful to health.
Something can be dannoso without being immediately pericoloso. The first word focuses on harm or damage; the second focuses on danger.
Pericoloso vs. Insicuro
Insicuro can mean unsafe, but it has several meanings depending on context, including “insecure” or “uncertain.”
When talking about a place or environment, it may overlap with pericoloso:
Questa zona non è sicura.
This area is not safe.
That sentence emphasizes a lack of safety. Pericoloso makes the idea of danger more explicit.
A Practical Comparison
| Italian word | Closest English meaning | Main emphasis |
| pericoloso | dangerous | Potential danger or harm |
| rischioso | risky | Risk or uncertainty |
| dannoso | harmful | Damage or negative effects |
| insicuro | unsafe/insecure | Lack of safety or security |
| sicuro | safe | Absence of significant danger |
These words can overlap, but they are not perfect synonyms. Context should determine which one you choose.
Common Mistakes With Pericoloso
The word itself is straightforward. The mistakes usually come from grammar, vocabulary choice, or translation habits.
Mistake 1: Using Pericoloso With Every Noun
A learner may memorize pericoloso and use it regardless of the noun.
Incorrect:
una strada pericoloso
Correct:
una strada pericolosa
The noun strada is feminine singular, so the adjective becomes pericolosa.
Mistake 2: Confusing Pericolo and Pericoloso
Incorrect:
La strada è pericolo.
Correct:
La strada è pericolosa.
You need an adjective after è when you are describing the road.
Conversely:
C’è un pericolo.
Here, pericolo is the noun “danger.”
Mistake 3: Assuming the English Word Controls the Ending
English does not distinguish masculine and feminine forms of “dangerous.” Italian does.
Do not ask:
“Which Italian word means dangerous?”
Ask:
“What noun am I describing, and what gender and number is it?”
That question will lead you to the correct form.
Mistake 4: Treating “Dangerous” and “Risky” as Identical
A risky choice is not automatically dangerous. Rischioso can refer to financial, strategic, or uncertain outcomes, while pericoloso more directly concerns danger.
Mistake 5: Translating Without Considering Context
A literal dictionary translation is a starting point, not always the finished translation.
pericoloso might become:
- dangerous
- unsafe
- hazardous
- risky, in some contexts
- harmful, in limited contexts
The surrounding sentence tells you which English expression sounds most natural.
What Is the Origin of Pericoloso?
Pericoloso belongs to the same Italian word family as pericolo, meaning “danger.”
The word ultimately traces back through Italian’s historical development to Latin periculum, associated with danger, risk, or trial. Italian formed the adjective pericoloso from this vocabulary family.
This connection is useful for learners because it creates a simple vocabulary network:
pericolo → danger
pericoloso → dangerous
Once you recognize the shared root, related words become easier to remember.
The English word peril is also historically related to the same Latin source, which can provide an additional memory connection for English speakers.
Is Pericoloso Formal or Informal Italian?
Pericoloso is a standard, everyday Italian adjective. It is not restricted to formal writing or casual speech.
You might hear it in:
- ordinary conversations
- travel situations
- safety warnings
- newspapers
- school materials
- workplace communication
- official notices
- descriptions of hazardous conditions
The context changes, but the adjective remains the same.
For instance, a friend might say:
Non andare lì, è pericoloso.
Don’t go there; it’s dangerous.
A formal warning could use a similar adjective in a more technical sentence:
Queste condizioni possono essere pericolose.
These conditions may be dangerous.
The difference is primarily register and sentence context, not the basic vocabulary item.
Example Sentences With Pericoloso
Here are examples covering several common situations.
Everyday Italian
Questo cane è pericoloso.
This dog is dangerous.
Non è pericoloso.
It isn’t dangerous.
È troppo pericoloso.
It’s too dangerous.
Quella strada è pericolosa.
That road is dangerous.
Travel and Places
La zona può essere pericolosa di notte.
The area can be dangerous at night.
Questa strada è pericolosa quando piove.
This road is dangerous when it rains.
These examples show that pericoloso can describe a risk that depends on time or conditions.
Activities
Nuotare qui è pericoloso.
Swimming here is dangerous.
È pericoloso guidare troppo velocemente.
It is dangerous to drive too fast.
Notice that the adjective remains masculine singular in è pericoloso because the construction is not agreeing with a feminine noun such as strada. It describes the activity or situation expressed by the infinitive.
Plural Examples
Questi animali sono pericolosi.
These animals are dangerous.
Le condizioni sono pericolose.
The conditions are dangerous.
These examples demonstrate why recognizing the noun’s number and gender matters.
A Simple Decision Guide
When writing or speaking, use this quick process.
Step 1: Identify the noun
What exactly are you describing?
- cane — dog
- strada — road
- animali — animals
- condizioni — conditions
Step 2: Determine gender and number
Is the noun masculine or feminine? Singular or plural?
Step 3: Choose the matching form
| If the noun is… | Use… |
| Masculine singular | pericoloso |
| Feminine singular | pericolosa |
| Masculine plural | pericolosi |
| Feminine plural | pericolose |
Step 4: Check the meaning
Ask whether you really mean dangerous, or whether risky, harmful, unsafe, or hazardous would better express the intended idea.
This final check is especially valuable when translating from English into Italian. Vocabulary should reflect meaning, not merely match words in a dictionary.
How to Remember Pericoloso Easily
A simple memory chain is:
pericolo = danger
pericoloso = dangerous
Then remember the adjective endings:
pericoloso → pericolosa → pericolosi → pericolose
Think of the endings as changing around the same core word:
pericolos- + o/a/i/e
You do not need to memorize four unrelated words. They are four grammatical forms of the same adjective.
Another useful strategy is to learn the word inside a phrase rather than by itself:
- un animale pericoloso
- una strada pericolosa
- animali pericolosi
- strade pericolose
Seeing the four forms next to familiar nouns makes the agreement rule much easier to recall when you need it.
Conclusion
Pericoloso means “dangerous” in Italian, but knowing that translation is only the first step. To use it correctly, remember that it is an adjective that agrees with the noun: pericoloso, pericolosa, pericolosi, pericolose. It is also worth separating pericoloso from pericolo (“danger”), rischioso (“risky”), and dannoso (“harmful”), because those words describe different aspects of risk. One final actionable tip: learn pericoloso together with real noun phrases such as una strada pericolosa and animali pericolosi rather than memorizing it alone. A common mistake to avoid is using pericoloso for every noun without checking gender and number. Once that agreement pattern becomes automatic, this everyday Italian word becomes remarkably easy to recognize and use naturally.
Frequently Asked Questions
Q1. What does pericoloso mean in English?
Pericoloso normally translates as “dangerous.” It is an Italian adjective used to describe something that may cause harm or present danger. Depending on context, English may use unsafe, hazardous, or risky instead. Its exact form changes according to the gender and number of the noun it describes.
Q2. Is pericoloso masculine or feminine?
Pericoloso is masculine singular, but the adjective itself can take four forms. Use pericolosa for feminine singular, pericolosi for masculine plural, and pericolose for feminine plural. The correct form depends on the noun being described, not on the English translation.
Q3. What is the difference between pericoloso and pericolo?
Pericoloso is an adjective meaning “dangerous,” while pericolo is a noun meaning “danger” or “hazard.” For example, una situazione pericolosa means “a dangerous situation,” whereas c’è un pericolo means “there is a danger.”
Q4. What is the opposite of pericoloso in Italian?
The most common opposite is sicuro, meaning “safe.” For example, un luogo sicuro means “a safe place.” Depending on context, innocuo (“harmless”) may also provide a more precise opposite when the focus is whether something can cause harm.
Q5. Is pericoloso the same as rischioso?
Not exactly. Pericoloso means “dangerous,” emphasizing possible harm or danger, while rischioso means “risky,” emphasizing risk or uncertainty. A financial decision can be rischiosa without being physically dangerous. The two adjectives overlap, but they should not automatically be treated as synonyms.
