duncify

dunce +‎ -ify

duncify (third-person singular simple present duncifies, present participle duncifying, simple past and past participle duncified)

1. (transitive) To make stupid in intellect.
   • July 8 1759 William Warburton, letter to Richard Hurd

     Here you have a fellow ten thousand times more duncified than dunce Webster

• “duncify”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.