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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

Vietnam is notorious for dangerous roads, with more than 10,000 people killed and 16,000 injured in traffic accidents in 2024.

From BBC • Apr. 7, 2026

Barron’s: In Road to Freedom, you wrote that you saw deindustrialization in the 1990s as dangerous for the economy.

From Barron's • Apr. 7, 2026

Cervantes said she was troubled by this request given that she broke no traffic laws and was the victim of a dangerous driver.

From Los Angeles Times • Apr. 7, 2026

I thought maybe he was dangerous and Mom was protecting me.

From "South of Somewhere" by Kalena Miller