1.Definition: awkwardly simple and provincial

"The nightlife of Montmartre awed the unsophisticated tourists"

Related Adjective(s):bumpkinly, hick, rustic

2.Definition: lacking complexity

"An unsophisticated machine"

Related Adjective(s):uncomplicated

3.Definition: not wise in the ways of the world

"Either too unsophisticated or too honest to promise more than he could deliver"

Related Adjective(s):unworldly