Adjectives

(s)icky, crappy, lousy, rotten, shitty, stinking, stinkyvery bad“a lousy play”, “it's a stinking world”
(s)decayed, rotten, rotteddamaged by decay; hence unsound and useless“rotten floor boards”, “rotted beams”, “a decayed foundation”
(s)rottenhaving decayed or disintegrated; usually implies foulness“dead and rotten in his grave”