adjective
Other Word Forms
- dangerously adverb
- dangerousness noun
- nondangerous adjective
- nondangerously adverb
- nondangerousness noun
- quasi-dangerous adjective
- quasi-dangerously adverb
- semidangerous adjective
- semidangerously adverb
- semidangerousness noun
- undangerous adjective
- undangerously adverb
Etymology
Origin of dangerous
First recorded in 1175–1225; Middle English da(u)ngerous “domineering, fraught with danger,” from Old French dangereus “threatening, difficult,” equivalent to dangier ( danger ) + -eus -ous
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.
Starting in January 2025, Nokia’s sensors had picked up a series of increasingly powerful cyberattacks coming from devices that hadn’t previously been considered dangerous.
From The Wall Street Journal • Apr. 3, 2026
"It's quite dangerous in a way, that misinformation and misguidance. Those students would have naturally thought they were going to be OK and go about their day as normal."
From BBC • Apr. 3, 2026
"It's suffocating," the 36-year-old coconut seller told AFP in Chiang Mai, a tourist destination among the areas affected by dangerous pollution levels this week.
From Barron's • Apr. 3, 2026
“President Trump promised to reinvest in America’s national security infrastructure, to make sure our Nation is safe in a dangerous world,” the document reads.
From Salon • Apr. 3, 2026
“But it’s dangerous water, and there’s a cliff to climb to reach them. They’re well protected.”
From "Impossible Creatures" by Katherine Rundell
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
