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 Quiz → GRE Quiz → ← needy negate → Study tips featuring "nefarious" Spot the Vocabulary Trap in Every Question Write GRE Words Into Your Own Sentences How Context Clues Save You on the SAT Related words SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal SAT abominable