ac·cept·a·ble

[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

ac·cept·a·bil·i·ty, ac·cept·a·ble·ness, noun
ac·cept·a·bly, adverb
un·ac·cept·a·bil·i·ty, noun
un·ac·cept·a·ble, adjective
un·ac·cept·a·ble·ness, noun
un·ac·cept·a·b·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To unacceptable
00:10
Unacceptable is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
acceptable (əkˈsɛptəbəl) [Click for IPA pronunciation guide]
 
adj
1.  satisfactory; adequate
2.  pleasing; welcome
3.  tolerable
 
accepta'bility
 
n
 
ac'ceptableness
 
n
 
ac'ceptably
 
adv

unacceptable (ˌʌnəkˈsɛptəbəl) [Click for IPA pronunciation guide]
 
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
Be prepared to reject the offer if the terms are unacceptable to you.
Of course, a defaulting country may regard such intrusions as an unacceptable
  violation of its sovereignty.
Certain kinds of flirtation deemed unacceptable today could perhaps one day be
  regarded as relatively harmless.
The risk introduced by this pavement marking should be completely unacceptable
  given the virtually non-existent benefit.
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