unsophisticated

not wise in the ways of the world; "either too unsophisticated or too honest to promise more than he could deliver"; "this helplessly unworldly woman"- Kate O'Brien

lacking complexity; "small and uncomplicated cars for those really interested in motoring"; "an unsophisticated machine"

awkwardly simple and provincial; "bumpkinly country boys"; "rustic farmers"; "a hick town"; "the nightlife of Montmartre awed the unsophisticated tourists"