adj. 25B6; adjective
the room was filthy : DIRTY, mucky, grimy, muddy, slimy, unclean; foul, squalid, sordid, nasty, soiled, sullied; polluted, contaminated, unhygienic, unsanitary; informal cruddy, grungy; Brit. informal grotty; poetic/literary besmirched.
his face was filthy : UNWASHED, unclean, dirty, grimy, smeared, grubby, muddy, mucky, black, blackened, stained; poetic/literary begrimed.
filthy jokes : OBSCENE, indecent, dirty, smutty, rude, improper, coarse, bawdy, vulgar, lewd, racy, off colour, earthy, ribald, risqué, adult, pornographic, explicit; informal blue, porn, porno, X-rated; N. Amer. informal raw.
you filthy brute! : DESPICABLE, contemptible, nasty, low, base, mean, vile, obnoxious; informal dirty (rotten), low-down, no-good.
he was in a filthy mood : BAD, foul, bad-tempered, ill-tempered, irritable, grumpy, grouchy, cross, fractious, peevish; informal snappish, snappy; Brit. informal shirty, stroppy, narky, ratty; N. Amer. informal cranky, ornery.
clean.
25B6; adverb filthy rich : VERY, extremely, tremendously, immensely, remarkably, excessively, exceedingly; informal stinking, awfully, terribly, seriously, mega, ultra, damn.