Etymology

bona fide

Today it means: In good faith; genuinely, sincerely. Full definition →

Latin bonā fidē
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The story

  1. Latin · borrowed frombonā fidē“in good faith”
  2. English todaybona fide

Unadapted borrowing from Latin bonā fidē (“in good faith”).

Etymology from Wiktionary, CC BY-SA 4.0.