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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.

Even threats that are shot down scatter dangerous shrapnel over large areas, and airports are often at risk.

From The Wall Street Journal • Apr. 8, 2026

Hunter also said the family were "really thankful" for Roberts apologising and accepting careless driving and "ideally" he would not have been found guilty of the dangerous driving offence.

From BBC • Apr. 7, 2026

Cholera, a dangerous bacterial infection that causes severe diarrhea and can be fatal without treatment, may be significantly reduced through diet.

From Science Daily • Apr. 7, 2026

"This was an incredibly dangerous mission," Caine said.

From Barron's • Apr. 6, 2026

She knew that if I thought it was important then it was bound to be dangerous, too.

From "Code Name Kingfisher" by Liz Kessler