WordNet sense 1 (spoiled and covered with eggs and larvae of flies):

maggoty

WordNet sense 2 (showing deterioration from age):

stale

WordNet sense 3 (foul and run-down and repulsive):

sordid, squalid

WordNet sense 4 (soiled or likely to soil with dirt or grime):

dirty, unclean, soiled

WordNet sense 5 (especially of reputation):

besmirched, spotted, tainted, sullied, tarnished, damaged, stained

WordNet sense 6 (marred by imperfections):

blemished