SCUMMY

scummy

(adjective) covered with scum; “the scummy surface of the polluted pond”

abject, low, low-down, miserable, scummy, scurvy

(adjective) of the most contemptible kind; “abject cowardice”; “a low stunt to pull”; “a low-down sneak”; “his miserable treatment of his family”; “You miserable skunk!”; “a scummy rabble”; “a scurvy trick”

Source: WordNet® 3.1

Etymology

Adjective

scummy (comparative scummier, superlative scummiest)

Covered in scum.

(slang) sleazy, worthless, no good

Source: Wiktionary

Scum"my, a.

Definition: Covered with scum; of the nature of scum. Sir P. Sidney.

Source: Webster’s Unabridged Dictionary 1913 Edition