出典:Wiktionary
From Middle English iwis, iwys, ywis (“certain, sure”), from 古期英語 ġewiss (“certain, sure”), from Proto-West Germanic *gawiss, from Proto-Germanic *gawissaz (“known, certain, sure”), from Proto-Indo-European *weyd- (“to know”).
Cognate with Dutch gewis (“sure”), German gewiss (“certain”), Danish vis (“sure”). More at wit, wis.
iwis (not comparable)