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.

Understanding the Context

A dangerous person, animal, thing, or activity could harm you: 2. A dangerous person, animal…. Learn more. DANGEROUS definition: full of danger danger or risk; causing danger; danger; perilous; risky; hazardous; unsafe.

Key Insights

See examples of dangerous used in a sentence. Definition of dangerous adjective in Oxford Advanced American 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 © 2026 dan ger ous (dān′ jər əs, dānj′ rəs), adj.

Final Thoughts

full of danger or risk; causing danger; perilous; risky; hazardous; unsafe. able or likely to cause physical injury: a dangerous criminal. 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. Use the word dangerous to describe anything that can potentially cause serious harm, like a snarling pit bull or an icy, treacherous road. 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.