dangerous

[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

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dangerous (ˈdeɪndʒərəs)
 
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
Something needs to be done about this dangerous intersection, he said,
  examining the damage.
Blood clots travel, which is why they are dangerous.
Marijuana never should have been included on the list of dangerous drugs.
The seas dropping water level is leading to dangerous consequences.
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