Synonyms for Reprobate (same or very similar meaning)
WordNet sense 1 (a person without moral scruples):
miscreantWordNet sense 2 (express strong disapproval of):
condemn, decry, excoriate, objurgateWordNet sense 3 (marked by immorality; deviating from what is considered right or proper or good):
depraved, immoral, perverse, pervertedWordNet sense 4 (lacking in integrity):
corruptFrom the ODE community, based on WordNetadd/edit