Demonstrate the falsity of

Wiktionary Word definitions in Wiktionary
vb. 1 (context transitive English) To cause someone to unlearn; to make someone forget something they have been taught. 2 (context transitive English) To cause something previously learned to be forgotten.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Unteach \Un*teach"\, v. t. [1st pref. un- + teach.] To cause to forget, or to lose from memory, or to disbelieve what has been taught. Experience will unteach us. --Sir T. Browne. One breast laid open were a school Which would unteach mankind the lust to ...

WordNet Word definitions in WordNet
v. cause to disbelieve; teach someone the contrary of what he or she had learned earlier cause to unlearn; "teach somebody to unlearn old habits or methods" [also: untaught ]