deprave verb
1604, Cawdrey: (depraue)
marre or corrupt, or put downe.
1626, Cockeram: (depraue)
to corrupt, to marre, also to speake euill of one.
1658, Phillips:
Not listed. Researcher's notes: While Phillips does not define "deprave", he does explain the meaning of "depravation": "(lat.) a spoiling, corrupting, or making nought"