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adj.
expressive of contempt; "curled his lip in a supercilious smile"; "spoke in a sneering jeering manner"; "makes many a sharp comparison but never a mean or snide one"
n.
witty language used to convey insults or scorn; "he used sarcasm to upset his opponent"; "irony is wasted on the stupid"; "Satire is a sort of glass, wherein beholders do generally discover everybody's face but their own"--Jonathan Swift
adj.
tending to diminish or disparage; "belittling comments"; "managed a deprecating smile at the compliment"; "deprecatory remarks about the book"; "a slighting remark"