unsophisticated

adjective

1. not sophisticated; simple; artless.
2. without complexity or refinements: a relatively unsophisticated mechanism.
3. unadulterated; pure; genuine.

adjective

1. lacking experience or worldly wisdom
2. marked by a lack of refinement or complexityan unsophisticated machine
3. unadulterated or genuine

adj.1620s, “unmixed,” from un- (1) “not” + sophisticated. Meaning “ingenuous, natural, inexperienced” is recorded from 1660s.