Definitions for unlearnʌnˈlɜrn
Random House Webster's College Dictionary
to forget or lose knowledge of.
to discard (ideas or behavior) as being false.
try to forget; put out of one's memory or knowledge
discard something previously learnt, like an old habit
To discard the knowledge of.
to forget, as what has been learned; to lose from memory; also, to learn the contrary of
to fail to learn