SQUALID

flyblown, squalid, sordid

(adjective) 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”

seamy, seedy, sleazy, sordid, squalid

(adjective) 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”

Source: WordNet® 3.1

Etymology 1

Adjective

squalid (comparative squalider, )

Extremely dirty and unpleasant.

Showing a contemptible lack of moral standards.

Etymology 2

Noun

squalid (plural squalids)

(zoology) Any member of the family Squalidae of dogfish sharks.

Source: Wiktionary

Squal"id, a. Etym: [L. squalidus, fr. squalere to be foul or filthy.]

Definition: Dirty through neglect; foul; filthy; extremely dirty. Uncomed his locks, and squalid his attrie. Dryden. Those squalid dens, which are the reproach of large capitals. Macaulay.

Source: Webster’s Unabridged Dictionary 1913 Edition