Definition of “dangerous” - English Dictionary

“dangerous” in British English

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uk /ˈdeɪn.dʒər.əs/ us /ˈdeɪn.dʒɚ.əs/

A2 A dangerous person, animal, thing, or activity could harm you:

dangerous chemicals
The men are armed and dangerous.
His parents won't let him play ice hockey because they think it's too dangerous.
[ + to infinitive ] It's dangerous to take more than the recommended dose.

More examples

  • The pipe was found to be releasing dangerous chemicals into the sea.
  • She walked home by herself, although she knew that it was dangerous.
  • Even a brief exposure to radiation is very dangerous.
  • Dense fog has made driving conditions dangerous.
  • These men are armed and dangerous, and should not be approached.

(Definition of “dangerous” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“dangerous” in American English

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us /ˈdeɪn·dʒər·əs, ˈdeɪndʒ·rəs/

able or likely to cause harm or death, or unpleasant problems:

Whooping cough is most dangerous for infants.
adverb us /ˈdeɪn·dʒə·rə·sli/

dangerously high winds

(Definition of “dangerous” from the Cambridge Academic Content Dictionary © Cambridge University Press)