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

Chinese President Xi Jinping warned at a recent summit with US President Donald Trump that mishandling Taiwan could put the relationship between the two superpowers in an "extremely dangerous situation".

From BBC • Jun. 9, 2026

The new one is better, but the thinking behind it still rests on a dangerous confusion.

From The Wall Street Journal • Jun. 9, 2026

“It was dangerous, to be sure,” continued Balthilda.

From "Rump: The (Fairly) True Story of Rumpelstilskin" by Liesl Shurtliff

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