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.

They have got some excellent technical players and will be dangerous, whoever they play.

From BBC • Jun. 10, 2026

The incident was reported as law enforcement agencies across Southern California have been making an effort to cut down dangerous e-bike riding in the region.

From Los Angeles Times • Jun. 10, 2026

Coal mines often leach dangerous chemicals like arsenic into waterways and are required to strictly monitor pollution discharge and keep it under certain limits.

From Salon • Jun. 10, 2026

A safety system detected dangerous levels of engine thrust, assumed a malfunction, and ordered the fuel supply to be cut off, the theory goes.

From BBC • Jun. 10, 2026

And trying to keep people from their jobs, from the livelihoods that put food on their plate and a roof over their heads, was as dangerous as the mountain next door.

From "Mountain of Fire" by Rebecca E. F. Barone

Vocabulary lists containing dangerous

Words Every Pirate Should Know

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

"Volcano!"

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

"Brothers in Hope"

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!