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.

Coal mines often leach dangerous chemicals like arsenic into waterways and are required to strictly monitor pollution discharge and keep it under certain limits.

From Salon • Jun. 10, 2026

Law enforcement officials also point out that any type of modification to e-bikes might not just be dangerous, but can also transform the e-bike into a motorcycle or moped under California law.

From Los Angeles Times • Jun. 10, 2026

With temperatures at 14 of the 16 host venues set to exceed dangerous levels according to researchers, there were fears this bottle ban could put fans' health at risk.

From BBC • Jun. 9, 2026

The large language model called Claude Fable 5 will mostly let users query Mythos, which the company previously deemed too dangerous for general release.

From The Wall Street Journal • Jun. 9, 2026

‘He can’t come. We can’t risk it. This mission is already dangerous enough.’

From "Code Name Kingfisher" by Liz Kessler

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