FILTHY Meaning of FILTHY in English [filthy] adj filth.i.er ; -est (14c) 1: covered with or containing filth: offensively dirty 2. a: underhand, vile b: obscene syn see dirty -- filth.i.ly adv -- filth.i.ness n Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012