1. To speak ill of; to depreciate; to malign; to revile. '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) ... Synonym: To corrupt, vitiate, contaminate, pollute. ... Origin: L. D... Found on http://www.encyclo.co.uk/local/20973