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
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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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Example sentences
Her skin was ghostly, her blood dangerously short of red cells.
To the officer who arrested him, the ancient story suddenly sounded dangerously
  contemporary.
One could argue that the values of both real estate and higher education are
  dangerously subject to collective delusion.
When wings are mis-matched in nature, flight-if possible at all-can be
  dangerously unpredictable.
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