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[deyn-jer-uh s, deynj-ruh s] /ˈdeɪn dʒər əs, ˈdeɪndʒ rəs/
full of danger or risk; causing danger; perilous; risky; hazardous; unsafe.
able or likely to cause physical injury:
a dangerous criminal.
Origin of dangerous
1175-1225; Middle English da(u)ngerous domineering, fraught with danger < Old French dangereus threatening, difficult, equivalent to dangier (see danger) + -eus -ous
Related 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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for dangerously
Contemporary Examples
Historical Examples
  • Two of the men were slightly wounded, and the other dangerously shot through the stomach.

    History of 'Billy the Kid' Chas. A. Siringo
  • Percy Roden was still in a dangerously exalted frame of mind.

    Roden's Corner Henry Seton Merriman
  • The first amount is too small to be always effective and the last is dangerously inflammable.

    House Rats and Mice David E. Lantz
  • "You see what awaits you if you persist in this," he said, in a dangerously quiet voice.

    Love-at-Arms Raphael Sabatini
  • Mr. Benton had been wounded in the war, an injury to his brain making him out of his head, though not dangerously so.

British Dictionary definitions for dangerously


causing danger; perilous
Derived Forms
dangerously, adverb
dangerousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for dangerously



early 13c., "difficult, arrogant, severe" (the opposite of affable), from Anglo-French dangerous, Old French dangeros (12c., Modern French dangereux), from danger (see danger).

In Chaucer, it means "hard to please, reluctant to give;" sense of "full of danger, risky" is from late 15c. Other words used in this sense included dangersome (1560s), dangerful (1540s). Related: Dangerously.

Online Etymology Dictionary, © 2010 Douglas Harper
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Idioms and Phrases with dangerously
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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