From Middle English fele, fæle, from Old English fǣle ("faithful, trusty, good; dear, beloved"), from Proto-Germanic *failijaz ("true, friendly, familiar, good"), from Proto-Indo-European *pey- ("to adore"). Cognate with Scots feel, feelie, West Frisian feilich ("safe"), Dutch veil ("for-sale"), Dutch veilig ("safe"), German feil ("for-sale"), Latin pīus ("good, dutiful, faithful, devout, pious").
From Middle English felen, from Old Norse fela ("to hide"), from Proto-Germanic *felhaną ("to conceal, hide, bury, trust, intrude"), from Proto-Indo-European *pele(w)-, *plē(w)-. Cognate with Old High German felahan ("to pass, trust, sow"), Old English fēolan ("to cleave, enter, penetrate").
From Middle English felen ("to come at (one's enemies), advance"), from Old English fēolan ("to cleave, enter, penetrate"), from Proto-Germanic *felhaną.
Inherited from an unattested Middle English word, borrowed from Old French feal, collateral form of feeil, from Latin fidelis.
Unknown; see fail#Etymology 2.
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