Hypertext Webster Gateway: "unlearn"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Unlearn \Un*learn"\, v. t. [1st pref. un- + learn.]
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. To fail to learn. [Obs.] --Dr. H. More.
From WordNet (r) 1.7 (wn)
unlearn
v 1: try to forget; put out of one's memory or knowledge
2: discard something previously learnt, like an old habit
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