D defs.my
Entry 2 senses Webster, 1913

Unlearn

· Un·learn · IPA /ʌnˈlɝn/
01 v. t. To forget, as what has been learned; to lose from memory; also, to learn the contrary of.
  1. 1.
    To forget, as what has been learned; to lose from memory; also, to learn the contrary of.
    “I had learned nothing right; I had to unlearn everything.” — Milner.
  2. 2.
    To fail to learn.[Obs.]