Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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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! sarcastic adj : expressing or expressive of ridicule that wounds [ant: unsarcastic]
Sarcasm is the use of irony to mock or convey contempt. "The distinctive quality of sarcasm is present in the spoken word and manifested chiefly by vocal inflections". The sarcastic content of a statement will be dependent upon the context in which it appears.