'Defilement' in the Bible

but chiefly them that walk after the flesh in the lust of defilement, and despise dominion. Daring, self-willed, they tremble not to rail at dignities:

They promise them liberty, when they themselves are the slaves of depravity—for by whatever anyone is defeated and overcome, to that [person, thing, philosophy, or concept] he is continually enslaved.

For if, after they have escaped the defilement of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in it and overcome, the last state has become worse for them than the first.