wis /waɪs/adverb 3verb 3adjective 2forms 4 adverb3 •(no longer used, rare) Certainly, surely.So I wis would the Dragon under him […] — 1884 •(no longer used, rare) Really, truly. •(no longer used, rare) Indeed. verb3 •(no longer used) To know. •(no longer used) To think, suppose.Howe'er you wis. — 1850 •(no longer used) To imagine, ween; to deem.And oh, that I should see that star remote / Yet His near Glory miss / Whereto the sun itself and stars do float / As motes, I wis! — 1889 adjective2 •(no longer used, rare) Certain. •(no longer used, rare) Sure.He was wis on his word.I am wis that it will happen. formswissed · wist · more wis · most wis