"squalidest" in the adjective sense
1. seamy, seedy, sleazy, sordid, squalid
morally 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"
2. flyblown, squalid, sordid
foul 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"
Source: WordNet® (An amazing lexical database of English)
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