acceptable

[ak-sep-tuh-buhl]
adjective
1.
capable or worthy of being accepted.
2.
pleasing to the receiver; satisfactory; agreeable; welcome.
3.
meeting only minimum requirements; barely adequate: an acceptable performance.
4.
capable of being endured; tolerable; bearable: acceptable levels of radiation.

Origin:
1350–1400; Middle English < Late Latin acceptābilis. See accept, -able

acceptability, acceptableness, noun
acceptably, adverb
unacceptability, noun
unacceptable, adjective
unacceptableness, noun
unacceptably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acceptable (əkˈsɛptəbəl)
 
adj
1.  satisfactory; adequate
2.  pleasing; welcome
3.  tolerable
 
accepta'bility
 
n
 
ac'ceptableness
 
n
 
ac'ceptably
 
adv

unacceptable (ˌʌnəkˈsɛptəbəl)
 
adj
1.  not satisfactory; inadequate: the standard was wholly unacceptable
2.  intolerable: hitting children is unacceptable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

unacceptable
late 15c., from un- (1) "not" + acceptable.

acceptable
late 14c., from O.Fr. acceptable, from L. acceptabilis, from acceptare (see accept).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Berger argues that without a protected corridor, the herd will die off, an
  outcome that he says should be unacceptable.
Full employment is still a distant dream-and that's unacceptable.
The sensor heats up during long exposures, building up unacceptable levels of
  noise.
Any changes to an original photograph not itemized here are unacceptable and
  will render the photograph ineligible for a prize.
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