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

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

1. something that may cause harm or injury.

Liable to inflict injury or harm; baneful in disposition or tendency: as, a dangerous man; a dangerous illness. In danger, as from illness; in a perilous condition: as, he is not dangerous.

dan•ger•ous•ly, adv. WordReference Random House Unabridged Dictionary of American English © 2026 dan•ger•ous (dān′ jər əs, dānj′ rəs), adj. full of danger or risk; causing danger; perilous; risky; …

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.

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

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

dangerous ground/territory : a situation in which you may do or say something that will have a bad result, make people angry, etc.