If you are learning Spanish or trying to understand a warning sign, you will likely encounter the word peligroso. It translates directly to dangerous or hazardous in English, but its usage spans far beyond a simple adjective on a traffic sign. Understanding how to use it correctly requires looking at its grammatical gender, common collocations, and the nuances that set it apart from other risk-related vocabulary.
We will break down what peligroso means, how it functions in everyday Spanish sentences, and common mistakes speakers make when translating risk from English to Spanish.
Defining Peligroso and Its Grammatical Roots
In Spanish, peligroso is an adjective that modifies masculine nouns. Because Spanish adjectives change form based on gender and number, you will also see peligrosa (feminine singular), peligrosos (masculine plural), and peligrosas (feminine plural).
The root noun is el peligro, which means danger or risk. When you attach the suffix -oso, it transforms the noun into an adjective meaning full of or characterized by that quality—much like the English suffix -ous in words like danger-ous.
- El camino es peligroso. (The road is dangerous.)
- La situación es peligrosa. (The situation is dangerous.)
- Los perros peligrosos. (The dangerous dogs.)
- Las calles peligrosas. (The dangerous streets.)
According to the Real Academia Española, adjectives ending in -o follow strict agreement rules with the noun they describe. Getting this agreement wrong is one of the most common beginner errors.
Contextual Usage: When to Use Peligroso
You can apply peligroso to physical threats, situations, or even abstract concepts like a volatile political climate. However, native speakers use it in specific contexts where risk is immediate or tangible.
Physical Locations and Environments
You will frequently see or hear the word applied to places that pose a physical threat. A steep cliff, a stormy ocean current, or an unlit alleyway at night can all be described as peligroso.
- No nades aquí; el agua es muy peligrosa. (Don't swim here; the water is very dangerous.)
- Ese barrio es peligroso por la noche. (That neighborhood is dangerous at night.)
Human Behavior and Personalities
When describing people, peligroso can mean physically threatening, untrustworthy, or reckless. For example, a driver who ignores traffic laws or someone who handles heavy machinery carelessly is often labeled as peligroso.
- Conducir a alta velocidad es peligroso. (Driving at high speed is dangerous.)
- No confíes en él; es un hombre peligroso. (Don't trust him; he is a dangerous man.)
Common Mistakes to Avoid
Language learners often translate English concepts word-for-word, leading to awkward or incorrect Spanish phrasing. Keep these tips in mind:
- Confusing the noun and adjective: Do not say es un peligroso. You must include a noun (es un hombre peligroso) or use the noun form (es un peligro).
- Overusing it for health: While you can say a disease is dangerous (una enfermedad peligrosa), medical contexts in Spanish often prefer terms like mortal (deadly) or grave (serious) depending on the exact severity.
- Ignoring preposition rules: When pairing peligroso with an action, use the preposition para (for) or de (of/to) correctly depending on the sentence structure.
FAQ
What is the noun form of peligroso?
The noun form is el peligro, which translates to danger or risk.
Is peligroso the same as letal?
No. While letal means lethal or causing death, peligroso simply means dangerous. Something can be dangerous without necessarily being fatal.
How do you make peligroso plural?
To make it plural for masculine nouns, add an 's' to form peligrosos. For feminine nouns, change the 'o' to 'a' and add an 's' to form peligrosas.
Can peligroso be used as a noun?
No, it is strictly an adjective. To refer to danger as a noun, use peligro.
