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Use "deceitfulness" in a sentence
"Now duplicity does not seem to pertain to lust, but rather to deceitfulness, which is a daughter of covetousness, according to Gregory (Moral. xxxi, 45)."
"The deceitfulness, that is, the depth of wickedness, and the abominableness, past all words, of thine own heart."
"It is what the scripture calls the deceitfulness of sin."