The Collaborative International Dictionary of English v.0.48:

Sarcastic \Sar*cas"tic\, Sarcastical \Sar*cas"tic*al\, a.
   Expressing, or expressed by, sarcasm; characterized by, or of
   the nature of, sarcasm; given to the use of sarcasm; bitterly
   satirical; scornfully severe; taunting.
   [1913 Webster]

         What a fierce and sarcastic reprehension would this
         have drawn from the friendship of the world! --South.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sarcastic
    adj 1: expressing or expressive of ridicule that wounds [ant:
           unsarcastic]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "sarcastic":
   Rabelaisian, acerb, acerbic, acid, acidic, acidulous, acrid,
   acrimonious, biting, bitter, captious, carping, caustic, cavilling,
   censorious, contemptuous, contumelious, corrosive, critical,
   cutting, cynical, derisive, derisory, disdainful, dry, harsh,
   incisive, ironic, ironical, jeering, malefic, malevolent,
   malicious, mocking, mordant, nasty, poisonous, pungent, ridiculing,
   sardonic, satiric, satirical, scathing, scornful, sharp, spiteful,
   stinging, tart, trenchant, venomous, virulent