Filth \Filth\, n. [OE. filthe, ful[eth]e, AS. f?l[eth], fr. f[=u]l foul; akin to OHG. f[=u]lida. See {Foul}, and cf. {File}.] 1. Foul matter; anything that soils or defiles; dirt; nastiness. 2. Anything that sullies or defiles the moral character; corruption; pollution. To purify the soul from the dross and filth of sensual delights. --Tillotson. {Filth disease} (Med.), a disease supposed to be due to pollution of the soil or water.