The Collaborative International Dictionary of English v.0.48:

Quizzical \Quiz"zic*al\ (kw[i^]z"z[i^]*kal), a.
   Relating to quizzing; given to quizzing; of the nature of a
   quiz; farcical; sportive.
   [1913 Webster] -- Quiz"zic*al*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quizzical
    adj 1: playfully vexing (especially by ridicule); "his face wore
           a somewhat quizzical almost impertinent air"- Lawrence
           Durrell [syn: mocking, teasing, quizzical]
    2: perplexed (as if being expected to know something that you do
       not know); "he had a quizzical expression" [syn:
       questioning, quizzical]

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "quizzical":
   absurd, agape, agog, all agog, amusing, bantering, bizarre, booing,
   burning with curiosity, catcalling, catechistic, chaffing,
   consumed with curiosity, curious, derisive, derisory, disbelieving,
   droll, eccentric, fleering, flippant, fooling, funny, ghoulish,
   gossipy, grinning, hilarious, hissing, hooting, humorous,
   incongruous, inquiring, inquisitional, inquisitive, inquisitorial,
   interested, interrogational, interrogative, interrogatory, itchy,
   jeering, jollying, joshing, kidding, laughable, leering, ludicrous,
   mocking, morbid, morbidly curious, odd, open-eyed, openmouthed,
   overcurious, panning, priceless, probing, prurient, puzzled,
   quaint, queer, querying, questioning, quizzing, ragging, railing,
   rallying, razzing, rich, ridiculing, ridiculous, risible, roasting,
   scoffing, scopophiliac, screaming, searching, skeptical, smart,
   smart-alecky, smart-ass, smirking, sneering, snickering,
   sniggering, snorting, supercurious, taunting, teasing, twitting,
   unbelieving, voyeuristic, whimsical, witty