Source : Webster's Revised Unabridged Dictionary (1913)

Blemish \Blem"ish\, v. t. [imp. & p. p. {Blemished}; p. pr. &
   vb. n. {Blemishing}.] [OE. blemissen, blemishen, OF. blemir,
   blesmir, to strike, injure, soil, F. bl[^e]mir to grow pale,
   fr. OF. bleme, blesme, pale, wan, F. bl[^e]me, prob. fr. Icel
   bl[=a]man the livid color of a wound, fr. bl[=a]r blue; akin
   to E. blue. OF. blemir properly signifies to beat one (black
   and) blue, and to render blue or dirty. See {Blue}.]
   1. To mark with deformity; to injure or impair, as anything
      which is well formed, or excellent; to mar, or make
      defective, either the body or mind.

            Sin is a soil which blemisheth the beauty of thy
            soul.                                 --Brathwait.

   2. To tarnish, as reputation or character; to defame.

            There had nothing passed between us that might
            blemish reputation.                   --Oldys.

Source : WordNet®

blemished
     adj 1: marred by imperfections [ant: {unblemished}]
     2: having a blemish or flaw; "a flawed diamond" [syn: {flawed}]