detracting from one's appearance, character, or reputation; unattractive or unseemly: an unbecoming hat; unbecoming language.

1590–1600; un-1 + becoming

unbecomingly, adverb
unbecomingness, noun

unapt, unsuitable, unfit. See improper.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unbecoming (ˌʌnbɪˈkʌmɪŋ)
adj (when postpositive, usually foll by of or an object)
1.  unsuitable or inappropriate, esp through being unattractive: an unbecoming hat
2.  not proper or seemly (for): manners unbecoming a lady

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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Word Origin & History

1598, from un- (1) "not" + becoming "fitting" (see become).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
His infractions included conduct unbecoming an officer, using intemperate
  language and being drunk on duty.
Although one sympathized with government workers but the behavior that is
  accompanying the strike is unbecoming.
Your rush to judgement is unbecoming to you and is sadly reminiscent of others
  who posts here and should remain nameless.
Calling any sovereign country a bully is unbecoming of an esteemed publication.
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