dan·ger·ous

[deyn-jer-uhs, deynj-ruhs]
adjective
1.
full of danger or risk; causing danger; perilous; risky; hazardous; unsafe.
2.
able or likely to cause physical injury: a dangerous criminal.

Origin:
1175–1225; Middle English da(u)ngerous domineering, fraught with danger < Old French dangereus threatening, difficult, equivalent to dangier (see danger) + -eus -ous

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Dangerous is always a great word to know.
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a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
Collins
World English Dictionary
dangerous (ˈdeɪndʒərəs) [Click for IPA pronunciation guide]
 
adj
causing danger; perilous
 
'dangerously
 
adv
 
'dangerousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

dangerous
early 13c., "difficult, arrogant, severe" (the opposite of affable), from Anglo-Fr. dangerous, O.Fr. dangeros (Mod.Fr. 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 (c.1540).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

dangerous

see little knowledge is a dangerous thing; live dangerously.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Blood clots travel, which is why they are dangerous.
However well intended some of the people involved may be or pretend to be, it
  is still a potentially dangerous scam.
There is absolutely nowhere to bike and if so, would be dangerous getting there.
And there is a sad history of chimps being abandoned or killed when they get
  too old and too dangerous to be cute.
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