DANGEROUS definition: full of danger danger or risk; causing danger; danger; perilous; risky; hazardous; unsafe. See examples of dangerous used in a sentence.

dangerous, hazardous, precarious, perilous, risky mean bringing or involving the chance of loss or injury. dangerous applies to something that may cause harm or loss unless dealt with carefully.

DANGEROUS definition: 1. A dangerous person, animal, thing, or activity could harm you: 2. A dangerous person, animal…. Learn more.

Definition of dangerous adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

dan•ger•ous•ly, adv. WordReference Random House Unabridged Dictionary of American English © 2025 dan•ger•ous (dān′ jər əs, dānj′ rəs), adj. full of danger or risk; causing danger; perilous; …

1. something that may cause harm or injury.

Definition of dangerous. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels.

Aug 6, 2025 · Uncover the meaning of "dangerous." This glossary entry provides definitions, etymology, real-world examples, synonyms, antonyms, and common phrases, enhancing your …

If something is dangerous, it is able or likely to hurt or harm you. It's a dangerous stretch of road. ...dangerous drugs. It's dangerous to jump to early conclusions.

Use the word dangerous to describe anything that can potentially cause serious harm, like a snarling pit bull or an icy, treacherous road.