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unnecessary

[uhn-nes-uh-ser-ee]
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adjective
  1. not necessary or essential; needless; unessential.
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noun, plural un·nec·es·sar·ies.
  1. unnecessaries, things that are not necessary or essential.
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Origin of unnecessary

First recorded in 1540–50; un-1 + necessary
Related formsun·nec·es·sar·i·ly [uhn-nes-uh-sair-uh-lee, -nes-uh-ser-] /ʌnˌnɛs əˈsɛər ə li, -ˈnɛs əˌsɛr-/, adverbun·nec·es·sar·i·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unnecessary

unnecessary

adjective
  1. not necessary
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Derived Formsunnecessarily, adverbunnecessariness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unnecessary

adj.

1540s, from un- (1) "not" + necessary. Related: Unnecessarily.

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Online Etymology Dictionary, © 2010 Douglas Harper