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Synonyms

dangerous

American  
[deyn-jer-uhs, deynj-ruhs] / ˈdeɪn dʒər əs, ˈdeɪndʒ rəs /

adjective

  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.


dangerous British  
/ ˈdeɪndʒərəs /

adjective

  1. causing danger; perilous

"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

dangerous Idioms  
  1. see little knowledge is a dangerous thing; live dangerously.


Other Word 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

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 ( danger ) + -eus -ous

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.

Deported not to their homelands but to unfamiliar cities deep inside Mexico, thousands of migrants are stranded in a dangerous, bureaucratic limbo with little support and no clear path forward.

From Los Angeles Times

Some salt substitutes contain potassium, which can build up to dangerous levels in people with kidney disease or those taking certain medications or supplements.

From Science Daily

“And then there were a couple of large incidents that brought to the forefront that these lakes are really dangerous lakes.”

From The Wall Street Journal

Justice Ketanji Brown Jackson, the lone dissenter, frames Colorado’s law as prohibiting merely “a dangerous therapy modality that, incidentally, involves provider speech.”

From The Wall Street Journal

She wrote that the majority’s ruling “opens a dangerous can of worms” that “threatens to impair states’ ability to regulate the provision of medical care in any respect.”

From Salon