Definitions

dangerous

[deyn-jer-uhs, deynj-ruhs] / ˈdeɪn dʒər əs, ˈdeɪndʒ rəs /

ADJECTIVE

hazardous, troubling

Synonyms

STRONGEST

alarming bad critical deadly fatal nasty perilous precarious risky serious terrible threatening treacherous ugly unhealthy unsafe unstable

STRONG

no-go

WEAK

breakneck chancy dangersome delicate dynamite exposed formidable hairy heavy hot impending impregnable insecure jeopardous loaded malignant menacing mortal on collision course parlous portentous pressing queasy serpentine shaky speculative thorny ticklish touch-and-go touchy urgent viperous vulnerable wicked

Antonyms

STRONGEST

OK agreeable certain good great happy harmless healthful healthy honest kind nice pleasant pleasing safe secure stable strong sure trivial true unimportant wholesome wonderful

WEAK

careful guarded unhazardous untroubled

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Dubbed Claude Fable 5, the new model that Anthropic released Tuesday is an update to the Mythos model that the company said was too dangerous to release widely.

From The Wall Street Journal • Jun. 11, 2026

Others in AI research said that Anthropic, by admitting it was silently interfering with the model to make it less useful, was setting a dangerous precedent.

From The Wall Street Journal • Jun. 11, 2026

They have got some excellent technical players and will be dangerous, whoever they play.

From BBC • Jun. 10, 2026

Law enforcement agencies across the region told The Times they’re trying to increase education for parents and young riders to cut down on dangerous crashes.

From Los Angeles Times • Jun. 10, 2026

One morning at roll call Adek was waiting at my usual spot, though it was dangerous for him to be out of his formation.

From "Not Nothing" by Gayle Forman

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