Synonyms for Grungy:

adj.

dirty (adjective)
mucky, unhygienic, begrimed, grimy.
dirty and unkempt (adjective)
grimy, grubby, disgusting, sloppy, foul, filthy, offensive, messy, unclean.
slovenly (adjective)
slovenly.
unclean (adjective)
impure, fetid, insalubrious, dirty, septic, filthy, muddy, icky, unsanitary, mucky, foul, shabby, dusty, sloppy, dingy, slovenly, grimy, crummy, unhygenic, smutty, toxic, grubby, infectious, murky, scruffy, obscene, offensive, unclean, odious, disgusting, putrid, untidy, festering, sordid, defiled, scatological, squalid.

n.

grungy (noun)
raunchy, soiled, unclean, grubby, dingy, begrimed, grimy, dirty.

v.

dirty (verb)
unhygienic, messy, contaminated.

Other synonyms:

Other relevant words:
contaminated, messy, begrimed, soiled, unhygienic, raunchy.