Wis

Part of speech: verb (v.)

To think; to suppose; to imagine; -- used chiefly in the first person sing. present tense, I wis. See the Note under Ywis. [Obs. or Poetic] "Howe'er you wis." R. Browning. Nor do I know how long it is (For I have lain entranced, I wis). Coleridge.

Part of speech: adverb (adv.)

Certainly; really; indeed. [Obs.] "As wis God helpe me." Chaucer.