unsophisticated

Synonyms: artless authentic bush-league callow childlike clean cornball corny crude folksy genuine green guileless homey inexperienced ingenuous innocent kid naive plain pure raw rookie straightforward unadulterated unaffected unartificial uncomplicated uninvolved unrefined unschooled unstudied untutored unworldly wide-eyed

Antonyms: cultured experienced refined sophisticated upper-class worldly