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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.

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

The shoot downs and the high-risk mission required to recover both crew members signal a more dangerous phase of the conflict, with direct confrontations increasing and no clear off-ramp in sight.

From Salon • Apr. 5, 2026

"It's the most dangerous military mission that I know of," James Jeffrey, a military strategist and top US diplomat for the Middle East, told the BBC.

From BBC • Apr. 4, 2026

Iran is ranked the 10th-most dangerous nation for Christians, according to Open Doors International, a Christian advocacy nonprofit.

From Los Angeles Times • Apr. 4, 2026

It was too dangerous to hate the Nazis.

From "Not Nothing" by Gayle Forman

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.