See smut in Webster's New World Roget's A-Z Thesaurus II
noun
Something that is offensive to accepted standards of decency:
bawdry, dirt, filth, obscenity, profanity, ribaldry, scatology, vulgarity. (Slang) raunch. See decent
verb
To soil with foreign matter:
bestain, discolor, stain. See clean, marksTo contaminate the reputation of:
befoul, besmear, besmirch, bespatter, blacken, cloud, denigrate, dirty, smear, smudge, soil, spatter, stain, sully, taint, tarnish. Idioms: give a black eye to, sling (or throw) mud on. See attack, clean
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