View synonyms for dangerous


[ deyn-jer-uhs, deynj-ruhs ]


  1. full of danger danger or risk; causing danger; danger; perilous; risky; hazardous; unsafe.
  2. able or likely to cause physical injury:

    a dangerous criminal.


/ ˈdeɪndʒərəs /


  1. causing danger; perilous

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Derived Forms

  • ˈdangerousness, noun
  • ˈdangerously, adverb

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Other Words From

  • danger·ous·ly adverb
  • danger·ous·ness noun
  • non·danger·ous adjective
  • non·danger·ous·ly adverb
  • non·danger·ous·ness noun
  • quasi-danger·ous adjective
  • quasi-danger·ous·ly adverb
  • semi·danger·ous adjective
  • semi·danger·ous·ly adverb
  • semi·danger·ous·ness noun
  • un·danger·ous adjective
  • un·danger·ous·ly adverb

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Word History and Origins

Origin of dangerous1

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

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Idioms and Phrases

see little knowledge is a dangerous thing ; live dangerously .

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Example Sentences

An attempt to disrupt the federal government or something like that, because you were actively involved in some Instagram and Twitter conversations tha are considered dangerous.

Rather than the vaccine strain reverting to the dangerous form, Dhere says bigger risk is that the wild coronavirus will mutate in ways that render certain vaccines less effective.

Most teams — kickers aside — looked to be in shape despite the absence of a preseason, although some appear more dangerous than others.

The splits in the GNA come at a dangerous moment as the warring parties have built up their forces around the Haftar-held strategic city of Sirte in the center of Libya’s coastline.

From Ozy

They had only told me about one property that was particularly dangerous, but any story that involves a shotgun resonates well beyond its intended borders.

An additonal 30,000 made it to Europe by other routes including commercial flights and dangerous overland passages.

The most dangerous attacks are those that undermine your perceived strength.

There were also crashes not due to either mechanical or human error but to a lack of warning of dangerous conditions.

Yes, cops are under stress and tension (though their jobs are far less dangerous than normally supposed).

The Wolf of Wall Street is a dangerous, incendiary work of art.

The people here retained the same paganism and barbarity, only they were not so dangerous, being conquered by the Muscovites.

The major-general kept him well informed of every movement of the enemy, and pointed out the dangerous isolation of Davout.

Undesirable inhabitants of the country are being sent away, especially the Japanese, who are more dangerous than the Chinese.

As if unwilling to trust himself longer in dangerous companionship, he went up to town with Thomas Carr.

Why use dangerous cosmetics when Jones' soap retains youth and health for the complexion, and fosters the development of beauty?


Definitions and idiom definitions from 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.




danger moneydangerous offender