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.

Queries about dangerous topics such as cybersecurity or bioweapons will be steered to an older Opus model.

From The Wall Street Journal • Jun. 11, 2026

It went on to warn that "a resumption of hostilities would be dangerous and would have serious regional consequences".

From Barron's • Jun. 11, 2026

A dangerous tapeworm that has been spreading across North America has now been detected in the Pacific Northwest, according to new research.

From Science Daily • Jun. 11, 2026

"The suggestion that books or resources acknowledging LGBTQ+ people somehow undermine neutrality is both misleading and dangerous," it added.

From BBC • Jun. 11, 2026

So anything written down was dangerous, because it could be seen at any time.

From "Found" by Margaret Peterson Haddix

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