adjective
Other Word Forms
Derived 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.
Anthropic released Fable, a next-generation “Mythos-class” model to the general public with guardrails that remove dangerous capabilities earlier this week.
From The Wall Street Journal • Jun. 13, 2026
Adoration of leaders can be dangerous and should not be a part of rational analysis.
From Barron's • Jun. 12, 2026
It went on to warn that "a resumption of hostilities would be dangerous and would have serious regional consequences".
From Barron's • Jun. 11, 2026
Both had denied causing death by dangerous driving and causing serious injury by dangerous driving.
From BBC • Jun. 11, 2026
But many, like Neel, went to their beds that night with heavy hearts because the leaders and heroes of the village were going on a dangerous quest for their sakes and might never return.
From "Rowan of Rin" by Emily Rodda
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.
