These words refer to sharp, contemptuous behaviour towards someone, specially when it is of a verbal nature. Sarcastic , which comes from a root meaning to tear flesh or to sneer, describes a person, statement, expression, attitude or tone of voice that is heavily ironic. A sarcastic comment is generally scornful or taunting in tone, often expressing the opposite of what it literally says. The word sarcastic , in fact, often points opposite of what it literally says. The word sarcastic , in fact, often points to obnoxious arrogance, lacerating mockery or wryly contemptuous teasing. By contrast, sardonic , which comes from a foot that refers to a poison causing fatal, laughter-like convulsions, emphasizes a less direct or aggressive approach in favour of a mocking or sneering attitude that may be witty, ironic or laughter-provoking. Where sarcastic suggests an attempt to express and inspire contempt, sardonic stresses the intent to ridicule. Also, sarcastic suggests single, ad hominem utterances, whereas sardonic may suggest a more far-teaching general attitude of sombre cynicism that is not always directed at a person: his sarcastic remarks about the "speed" and "competence" of the waiters; his sardonic view of the possibilities for social reform; She kept her audience in stitches with the sardonic quips she tossed off half-consciously under her breath; meeting the students?brash, sarcastic laughter with a chilling, sardonic smile.

Biting refers most specifically to remarks alone, but suggests incisive or telling utterances that may express animus but need not be personal in intent: a biting critique of bureaucratic inefficiency. Cutting is close to biting , but here the word specifically indicates a harsh, personal rejection: a cutting remark on his bad manner; turning away from him with a cutting disdain. Caustic comes from a Greek root meaning to burn. It points to a critical attitude that is so sharp in its expression as to be searing, scathing or corrosive: the caustic satires of an angry, embittered author; a brilliant critic whose caustic wit made him many enemies.