From Middle English trewes, triwes, trues, plural of trewe, triewe, true (“faithfulness, assurance, pact”), from Old English trēowa, singularized plural of trēow, trȳw (“faith; pledge; agreement”), from Proto-West Germanic *treuwu, from Proto-Germanic *trewwō (compare Dutch trouw, German Treue, Danish tro, French trêve [< Germanic]), noun form of *triwwiz (“trusty, faithful”). More at true.