Adjectives

(s)abject, low, low-down, miserable, scummy, scurvyof 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”
(s)scummycovered with scum“the scummy surface of the polluted pond”