The Collaborative International Dictionary of English v.0.48:

Unmarred \Unmarred\
   See marred.

WordNet (r) 3.0 (2006):

unmarred
    adj 1: free from physical or moral spots or stains; "an
           unblemished record"; "an unblemished complexion" [syn:
           unblemished, unmarred, unmutilated] [ant:
           blemished]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "unmarred":
   bright, entire, fresh, harmless, intact, inviolate, mint, perfect,
   pristine, scatheless, sound, unbroken, unbruised, undamaged,
   undefaced, undeformed, undemolished, undestroyed, unfaded,
   unharmed, unhurt, unimpaired, uninjured, unmaimed, unmangled,
   unmarked, unscarred, unscathed, unscratched, unshattered,
   unspoiled, untorn, untouched, unwithered, unworn, virgin