iwis (adv.)
[archaism] assuredly, certainly, truly
MV II.ix.68 [Arragon reading the portrait's schedule] There be fools alive iwis, / Silvered o'er
Per II.Chorus.2 [Gower alone, of Antiochus] His child, iwis, to incest bring
R3 I.iii.101 [Richard to Rivers, of Queen Elizabeth's marriage] Iwis your grandam had a worser match
TS I.i.62 [Katherina to Hortensio, of marriage] Iwis it is not halfway to her heart
See also...