Ywis /(?)/

Y·wis

Ywis

adv.
  1. Certainly; most likely; truly; probably. [Obs. or Archaic]
    Ywis,” quod he, “it is full dear, I say.”
    She answered me, “I-wisse, all their sport in the park is but a shadow to that pleasure that I find in Plato.”
    — Ascham.
    A right good knight, and true of word ywis.
    Our ship, I wis, Shall be of another form than this.