mistaught (?.)

• Gothic
• Philistine
• barbarous
• bookless
• deceived
• functionally illiterate
• grammarless
• heathen
• hoodwinked
• ill-educated
• illiterate
• led astray
• lowbrow
• misadvised
• misdirected
• misguided
• misinformed
• misinstructed
• misled
• nonintellectual
• pagan
• rude
• unbooked
• unbookish
• unbooklearned
• unbriefed
• uncultivated
• uncultured
• unedified
• uneducated
• unerudite
• unguided
• uninstructed
• unintellectual
• unlearned
• unlettered
• unliterary
• unread
• unrefined
• unscholarly
• unschooled
• unstudious
• untaught
• untutored