Webster’s Revised Unabridged Dictionary · 1913
Deprave
De·prave′ (dē·prāv′), v. t. [imp. & p. p. Depraved (-prāvd′); p. pr. & vb. n. Depraving.] [L. depravare, depravatum; de- + pravus crooked, distorted, perverse, wicked.] 1. To speak ill of; to depreciate; to malign; to revile. [Obs.]
And thou knowest, conscience, I came not to chide Nor deprave thy person with a proud heart. Piers Plowman.
2. To make bad or worse; to vitiate; to corrupt.
Whose pride depraves each other better part. Spenser.
Syn. — To corrupt; vitiate; contaminate; pollute.