Adjectives

(s)seamy, seedy, sleazy, sordid, squalidmorally degraded“a seedy district”, “the seamy side of life”, “sleazy characters hanging around casinos”, “sleazy storefronts with … dirt on the walls” (Seattle Weekly), “the sordid details of his orgies stank under his very nostrils” (James Joyce), “the squalid atmosphere of intrigue and betrayal”
(s)flyblown, squalid, sordidfoul and run-down and repulsive“a flyblown bar on the edge of town”, “a squalid overcrowded apartment in the poorest part of town”, “squalid living conditions”, “sordid shantytowns”