Source : WordNet®

untaught
     See {unteach}

untaught
     adj : lacking in schooling; "untaught people whose verbal skills
           are grossly deficient"; "an untutored genius";
           "uneducated children" [syn: {unschooled}, {untutored}]

unteach
     v 1: cause to disbelieve; teach someone the contrary of what he
          or she had learned earlier
     2: cause to unlearn; "teach somebody to unlearn old habits or
        methods"
     [also: {untaught}]