Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

Source : WordNet®

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