From Middle English felun, feloun, from Anglo-Norman felun ("traitor, wretch"), from Medieval Latin fellō, from Frankish *fellō ("wicked person"), from Proto-Germanic *fillô, *filjô, from Proto-Germanic *faluz ("cruel, evil") (compare English fell ("fierce"), Middle High German vālant ("imp")), related to *fellaną (compare Dutch villen, German fillen ("to whip, beat"), both from Proto-Indo-European *pelh₂- ("to stir, move, swing") (compare Old Irish ad·ella, di·ella, Umbrian pelsatu, Latin pellō ("to drive, beat"), Latvian lijuôs, plītiês, Ancient Greek πέλας ("near"), πίλναμαι, Old Armenian հալածեմ ("I pursue").
Probably from Latin fel ("gall, poison").
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