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
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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
It is completely unnecessary in drinks, but once the rich started doing it the
  poor people wanted to do it too.
Carrying unnecessary weight in your vehicle makes your engine work harder.
Instead, they took an unnecessary risk for the sake of not changing a mission.
Winfrey's perfection of the art of acting sincere probably made the development
  of dramatic range impossible-and unnecessary.
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