adjective
Other Word Forms
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 ( see danger) + -eus -ous
Explanation
Use the word dangerous to describe anything that can potentially cause serious harm, like a snarling pit bull or an icy, treacherous road. The earliest meaning of the word dangerous was "difficult or arrogant." When Geoffrey Chaucer wrote "The Canterbury Tales" in the 1300s, he used dangerous to mean "hard to please." Gradually the meaning changed, so that by the late fifteenth century, dangerous meant "liable to cause hurt" or "risky." Just as popular were two other danger-related words that we don't use anymore today: dangersome and dangerful, which at the time could be used interchangeably with dangerous.
Vocabulary lists containing dangerous
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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.
"It looks like it's docile, it looks like your Florida emblem, but it can be dangerous."
From BBC ● Oct. 17, 2026
“As attorney general, I’ve sued some of the largest companies in the world … for taking advantage of our kids by exposing them to dangerous, addictive material,” Paxton said after defeating Cornyn in May.
From Salon ● Oct. 17, 2026
They also cautioned drivers about dangerous crosswinds, particularly on elevated roadways.
From Barron's ● Oct. 17, 2026
The red flag alert in effect Thursday is one step below the rare “particularly dangerous situation” warning that was issued in advance of the Palisades fire.
From Los Angeles Times ● Oct. 16, 2026
His deep, matter-of-fact tone made him seem all the more dangerous.
From "Will’s Race for Home" by Jewell Parker Rhodes
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Get a wordDefinitions 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.
