Thesaurus

abhorrent, afoul, Augean, bawdy, bedraggled, befouled, begrimed, below the belt, bespattered, besplashed, bilgy, black, blasphemous, blue, buggy, charnel, cheating, cobwebby, creepy, detestable, dingy, dirty, dirty-faced, dirty-minded, disgustful, disgusting, distasteful, draggled, dust-covered, dusty, enmeshed, entangled, evil, faecal, fecal, feculent, fetid, filthy, flyblown, foetid, foul, foul-mouthed, foul-smelling, foul-spoken, fouled, frowsty, funky, fusty, gamey, gamy, ghastly, ghoulish, greasy, grimy, grubby, grungy, hateful, hideous, high, horrid, horrific, ill-scented, ill-smelling, illegible, impure, indecent, indecipherable, intermeshed, intertwined, knotted, knotty, lewd, loathly, loathsome, lousy, maculate, malodorous, malodourous, marked-up, matted, mephitic, miasmic, morbid, mucky, muddy, musty, nasty, niffy, noisome, objectionable, obnoxious, obscene, odoriferous, odorous, off-color, offensive, oily, out-of-bounds, outrageous, partial, profane, putrid-smelling, rancid, rank, rank-smelling, ratty, raunchy, raw, reeking, repellant, repellent, repelling, repugnant, repulsive, revolting, ribald, rootbound, salacious, scabrous, scatological, scrimy, scummy, sepulchral, skanky, smelly, smudgy, smutty, snarled, snarly, snot-nosed, snotty, soiled, sooty, sordid, sour, spattered, splashed, squalid, stinking, stinky, tangled, thrown, thrown and twisted, travel-soiled, travel-stained, unclean, uncleanly, unclear, undecipherable, unfair, unjust, unpalatable, unpeasant-smelling, unpleasant, unreadable, unsporting, unsportsmanlike, unswept, untidy, unwashed, verminous, wicked, yucky

foul is a ADJ.

back up, befoul, choke, choke off, clog, clog up, congest, contaminate, defile, foul, maculate, pollute

foul is a VERB.