To discard the knowledge of.
To break a habit.
Innate, inherent or inborn.
Suckling is unlearnt behaviour in mammals.
Not educated
How much do I know / To talk out of turn / You might say that I'm young / You might say I'm unlearned / But there's one thing I know / Though I'm younger than you / Even Jesus would never / Forgive what you do Bob Dylan - Masters of War