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Unacceptable - 3 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.

Unacceptable

Un`ac*cept"a*ble\, a. Not acceptable; not pleasing; not welcome; unpleasant; disagreeable; displeasing; offensive. -- Un`ac*cept"a*ble*ness, n. -- Un`ac*cept"a*bly, adv.

unacceptable 
1483, from un- (1) "not" + accept + -able.
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