Meaning

noun any substance considered disgustingly foul or unpleasant

noun the state of being covered with unclean things

noun a state characterized by foul or disgusting dirt and refuse

originFrom Middle English filth, from Old English fȳlþu, from Proto-West Germanic *fūliþu, equivalent to foul + -th (abstract nominal suffix).

Etymology from Wiktionary, CC BY-SA 3.0