Scum·my a. Covered with scum; of the nature of scum.
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  scummy
       adj 1: 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" [syn: abject, low,
               low-down, miserable, scurvy]
       2: covered with scum; "the scummy surface of the polluted pond"