Un·be·com·ing a.  Not becoming; unsuitable; unfit; indecorous; improper.
     My grief lets unbecoming speeches fall.   --Dryden.
  -- Un*be*com*ing*ly, adv. -- Un*be*com*ing*ness, n.
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  unbecomingness
       n : the quality of being unbecoming [ant: becomingness]