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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.

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

From Barron's • Apr. 6, 2026

“This is an incredibly dangerous authority to have as unrestricted as it is.”

From Salon • Apr. 6, 2026

Ultimately, the risk is that prolonged war and indulgent external backing produce a state whose pathologies are dangerous in and of themselves.

From The Wall Street Journal • Apr. 5, 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

“Right now, a very dangerous farm,” Nicole said.

From "Storm Runners" by Roland Smith

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