dirtiest
dir-ti-est
adjective
The superlative form of 'dirty', meaning most unclean, soiled, or morally corrupt.
"That was the dirtiest trick I've ever seen."
Thesaurus
Synonyms: foul-mouthed, off-color, lewd, bawdy, profane, ribald, cruddy, obscene, raunchy, filthy, foul-spoken, salacious
Antonyms: clean, make clean, uncontaminating, unobjectionable