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 [informal], hick [N. Amer, informal], rustic, desi [Asia], cornpone [US, informal]

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