The Collaborative International Dictionary of English v.0.48:

Uncover \Un*cov"er\, v. t. [imp. & p. p. Uncovered; p. pr. &
   vb. n. Uncovering.] [1st pref. un- + cover.]
   1. To take the cover from; to divest of covering; as, to
      uncover a box, bed, house, or the like; to uncover one's
      body.
      [1913 Webster]

   2. To show openly; to disclose; to reveal. "To uncover his
      perjury to the oath of his coronation." --Milton.
      [1913 Webster]

   3. To divest of the hat or cap; to bare the head of; as, to
      uncover one's head; to uncover one's self.
      [1913 Webster]

WordNet (r) 3.0 (2006):

uncovered
    adj 1: not covered with clothing; "her exposed breast" [syn:
           exposed, uncovered]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "uncovered":
   bald, bare, bare-handed, bared, clear, cleared, defenseless,
   denudated, denuded, disclosed, divested, exposed, free, guardless,
   helpless, laid bare, naked, open, peeled, showing, stripped,
   unarmed, unarmored, unattended, unclogged, unclosed, undefended,
   unfortified, ungarrisoned, unguarded, unhidden, unobstructed,
   unprotected, unrestricted, unscreened, unsheltered, unshielded,
   unstopped, unsuspecting, unveiled, unwarned, unwatched, weaponless,
   wide-open