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Definition of unacceptable - 2 dictionary results
un·ac·cept·a·ble   (ŭn'ĭk-sěp'tə-bəl, -āk-)   
adj.  Not acceptable; unsatisfactory.
un'ac·cept'a·bil'i·ty n., un'ac·cept'a·bly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

unacceptable 
Use unacceptable in a Sentence
1483, from un- (1) "not" + accept + -able.
Online Etymology Dictionary, © 2001 Douglas Harper
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