出典:Wiktionary
From Middle English forthy, from 古期英語 forþȳ, for þȳ [þe] (“because [that]”), forþon (“because, since”), from for + þȳ, þon (“by that, therefore”), instrumental case of þæt (“that”); Cognate with Yola farthoo (“why”), Old Norse fyrir því (at) (Danish & Norwegian fordi (“because”), Swedish för att). More at for, the, that.
forthy (not comparable)