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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. 2018.
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Examples from the Web for dangerousness
Historical Examples
  • It was not his intelligence which he thought we underrated, but his dangerousness.

    Prester John John Buchan
  • August paused a moment, checked by a sense of the dangerousness of his undertaking.

    The End Of The World Edward Eggleston
  • He was like an elephant in his hugeness, and suppleness, his dangerousness, and his gentleness.

    Mount Music

    E. Oe. Somerville and Martin Ross
  • The dangerousness may either lie in the nature of a person or thing, or be imposed upon it.

  • Never a calf of them will desert to Rawhide, for all their dangerousness; nor I ain't goin' to have any fuss over it.

    The Virginian Owen Wister
  • The dangerousness, the excitingness, of being rich struck Mr. Prohack very forcibly.

    Mr. Prohack

    E. Arnold Bennett
  • All their plottings, their threats, their dangerousness dissipated like mist before the command of this one resolute man.

    The Mystery Stewart Edward White and Samuel Hopkins Adams
  • After the microbe has been found and named his dangerousness remains unattenuated.

    The Secret Life

    Elizabeth Bisland
  • The dangerousness of their characters first began to reveal itself after they had become dangerous by their present position.

  • I was often compelled, by the dangerousness of the way, to deviate considerably from the direction I wished to pursue.

    Caleb Williams William Godwin
British Dictionary definitions for dangerousness


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 dangerousness



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 dangerousness
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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