WordWeb Online

1. Not wise in the ways of the world
   "either too unsophisticated or too honest to promise more than he could deliver"
   - unworldly
    
2. Lacking complexity
   "an unsophisticated machine"
   - uncomplicated
    
3. Awkwardly simple and provincial
   "the nightlife of Montmartre awed the unsophisticated tourists"
   - bumpkinly, hick [N. Amer], rustic, desi [Asia]

See also: naif, naïf, naive, naïve, provincial, simple