"untaught" in the verb sense
1. unteach
cause to disbelieve teach someone the contrary of what he or she had learned earlier
2. unteach
cause to unlearn
"teach somebody to unlearn old habits or methods"
"untaught" in the adjective sense
1. unschooled, untaught, untutored
lacking in schooling
"untaught people whose verbal skills are grossly deficient"
"an untutored genius"
"uneducated children"
Source: WordNet® (An amazing lexical database of English)
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