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”

lacking experience of life

• “a callow youth of seventeen”

awkwardly simple and provincial

• “bumpkinly country boys”
• “rustic farmers”
• “a hick town”
• “the nightlife of Montmartre awed the unsophisticated tourists”

lacking sophistication