unnecessary

[uhn-nes-uh-ser-ee]
adjective
1.
not necessary or essential; needless; unessential.
noun, plural unnecessaries.
2.
unnecessaries, things that are not necessary or essential.

Origin:
1540–50; un-1 + necessary

unnecessarily [uhn-nes-uh-sair-uh-lee, -nes-uh-ser-] , adverb
unnecessariness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unnecessary (ʌnˈnɛsɪsərɪ, -ɪsrɪ)
 
adj
not necessary
 
un'necessarily
 
adv
 
un'necessariness
 
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

unnecessary
1548, from un- (1) "not" + necessary.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Don't look down, the climber below me kept repeating unnecessarily.
It was obviously and quite unnecessarily out of his way, though not much so.
And, by telling people that it's all about selfishness, you're alienating a
  huge potential part of the market unnecessarily.
Thus, the software avoids raising alarms unnecessarily.
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