Meaning

noun a person without moral scruples

verb reject (documents) as invalid

verb abandon to eternal damnation

originFirst attested in c. 1425, in Middle English; inherited from Middle English reprobat(e) (“condemned, damned”, also used as the past participle of reprobaten), borrowed from Latin reprobātus (“disapproved, rejected, condemned”), perfect passive participle of reprobō, see -ate (adjective-forming suffix). The noun was derived from the adjective by substantivization, see -ate (noun-forming suffix).

Etymology from Wiktionary, CC BY-SA 3.0