WordNet sense 1 (vile; despicable):

lousy

WordNet sense 2 (offensive or even (of persons) malicious):

awful, nasty

WordNet sense 3 (characterized by obscenity):

foul, smutty

WordNet sense 4 ((of behavior or especially language) characterized by obscenity or indecency):

dirty

WordNet sense 5 (soiled or likely to soil with dirt or grime):

unclean, soiled