SAT GRE nefarious Definition Wicked or criminal; extremely immoral. Example "The villain revealed his nefarious plan to take over the city." Sign in to save SAT PDF — $25 GRE PDF — $25 ← needy negate → Study tips featuring "nefarious" How Context Clues Save You on the SAT Related words SAT antonym SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal