Green’s Dictionary of Slang

skelly adj.

[skell n.]

(US) seedy, run-down.

[UK]W. Sherman Times Square 10: […] 127: They got only skelly-lookin’ broads in his joints.
[US]M. McAlary Buddy Boys 152: [E]ating in the middle of this skelly apartment with roaches crawling around on the table.