I wis

I wis (comparative more I wis, superlative most I wis)

1. assuredly, truly, indeed
   • c. 1593 (date written), William Shakespeare, “The Tragedy of Richard the Third: […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene iii]:

     I wis, your grandam had a worser match

• Wiis

• I wise, wys, wyse, vis, vish, wish, i wis, iwis

From Middle English iwis, from Old English ġewiss (“certainly, indeed”). More at wis.

I wis (comparative mair I wis, superlative maist I wis)

1. certainly, assuredly, indeed, truly