WordWeb Online

1. (of land or fields) not prepared for raising crops
   "uncultivated land"
    
2. (of persons) lacking art or knowledge
   "uncultivated persons have full means of knowing with absolute certainty God's existence";
   - artless, uncultured
    
3. Characteristic of a person who is not cultivated or does not have intellectual tastes
   "uncultivated tastes";
   - lowbrow, lowbrowed

See also: nonintellectual, uncultivable, uncultivatable, unintellectual, unrefined

Antonym: cultivated