unused

[uhn-yoozd for 1, 2; uhn-yoost for 3]
adjective
1.
not used; not put to use: an unused room.
2.
never having been used: an unused postage stamp.
3.
not accustomed: unused to cold winters.

Origin:
1250–1300; Middle English; see un-1, used

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unused
 
adj (foll by to)
1.  not being or never having been made use of
2.  not accustomed or used (to something)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

unused
c.1300, "unaccustomed," from un- (1) "not" + pp. of use (v.). Meaning "not employed" is recorded from late 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It will humble you a bit when you start using all those unused muscles.
Programs that permit the donation of good, unused drugs to the needy owe their
  existence to the lobbying by families of patients.
What the calipers cannot measure is whether the brain inside the skull is a
  used one or an unused one.
Simple steps include driving at slower speeds, avoiding quick accelerations and
  removing unused cargo racks, which create drag.
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