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adjective
grungy - Grimy; dirty
sordid - Dirty and unpleasant.
noun
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cesspool - A place or situation that is filthy, corrupt, or morally degraded.
squalor - A state of being extremely dirty and unpleasant, especially as a result of poverty or neglect
vulgar - Lacking sophistication or good taste; unrefined
lewd - Crude and offensive in a sexual way
slimy - Covered by or having the feel or consistency of slime
smog - Fog or haze combined with smoke and other atmospheric pollutants
nounverb verb
stink - Have a strong unpleasant smell
odious - Extremely unpleasant; repulsive.
scuzzy - Dirty and unpleasant
fetid - Smelling extremely unpleasant