The Collaborative International Dictionary of English v.0.48:

Bashful \Bash"ful\ (b[a^]sh"f[.u]l), a. [See Bash.]
   1. Abashed; daunted; dismayed. [Obs.]
      [1913 Webster]

   2. Very modest, or modest to excess; constitutionally
      disposed to shrink from public notice; indicating extreme
      or excessive modesty; shy; as, a bashful person, action,
      expression.
      [1913 Webster]

   Syn: Diffident; retiring; reserved; shamefaced; sheepish.
        [1913 Webster]

WordNet (r) 3.0 (2006):

bashful
    adj 1: self-consciously timid; "I never laughed, being bashful;
           lowering my head, I looked at the wall"- Ezra Pound
    2: disposed to avoid notice; "they considered themselves a tough
       outfit and weren't bashful about letting anybody know it";
       (`blate' is a Scottish term for bashful) [syn: bashful,
       blate]

Moby Thesaurus II by Grady Ward, 1.0:

122 Moby Thesaurus words for "bashful":
   Olympian, abashed, aloof, autistic, awkward, backward, blank,
   blushful, boggling, chilled, chilly, close, cold, confused,
   conscious, constrained, cool, cowardly, coy, demure, demurring,
   detached, diffident, discreet, dissociable, distant, embarrassed,
   expressionless, faltering, fearful, fearing, fearsome, forbidding,
   frigid, frosty, goosy, guarded, hesitant, hesitating, icy,
   ill at ease, impassive, impersonal, in a tizzy, in fear,
   inaccessible, inarticulate, incompatible, insociable, introverted,
   jumpy, meek, modest, mopey, mopish, morose, mousy, nervous,
   nongregarious, offish, qualmish, rabbity, recoiling, remote,
   removed, repressed, reserved, restrained, reticent, retiring,
   scary, scrupulous, self-conscious, self-contained, self-effacing,
   self-sufficient, shaky, shamefaced, shamefast, sheepish, shivery,
   shrinking, shy, skittery, skittish, snug, socially incompatible,
   squeamish, stammering, standoff, standoffish, startlish, stickling,
   subdued, sullen, suppressed, timid, timorous, trembling, tremulous,
   trepidant, trigger-happy, unaffable, unapproachable, unassertive,
   unassuming, unassured, unclubbable, uncomfortable, uncommunicative,
   uncompanionable, unconfident, uncongenial, undemonstrative, uneasy,
   unexpansive, unfriendly, ungenial, unostentatious, unsociable,
   unsocial, withdrawn