Etymology
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malefactor (n.)

mid-15c., malefactour, "a law-breaker, a criminal, a felon," from Latin malefactor, agent noun from past participle stem of malefacere "to do evil," from male "badly" (see mal-) + facere "to do, make" (from PIE root *dhe- "to set, put"). From late 15c. in the now-obsolete sense of "one who does evil or injury to another" (the opposite of benefactor).

updated on November 06, 2018

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Definitions of malefactor from WordNet

malefactor (n.)
someone who has committed a crime or has been legally convicted of a crime;
Synonyms: criminal / felon / crook / outlaw
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.