Example : Either too unsophisticated or too honest to promise more than he could deliver.
This helplessly unworldly woman.

Synonyms : unworldly

Example : Small and uncomplicated cars for those really interested in motoring.
An unsophisticated machine.

Synonyms : uncomplicated

Example : Bumpkinly country boys.
Rustic farmers.
A hick town.
The nightlife of Montmartre awed the unsophisticated tourists.

Synonyms : bumpkinly, hick, rustic