Source : Webster's Revised Unabridged Dictionary (1913)

Unblemished \Un*blem"ished\, a.
   Not blemished; pure; spotless; as, an unblemished reputation
   or life. --Addison.

Source : WordNet®

unblemished
     adj : free from physical or moral spots or stains; "an unblemished
           record"; "an unblemished complexion" [ant: {blemished}]