• adjective:   not wise in the ways of the world

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

• adjective:   lacking complexity

  Example: "An unsophisticated machine"

• adjective:   lacking sophistication
• adjective:   lacking experience of life
• adjective:   awkwardly simple and provincial

  Example: "The nightlife of Montmartre awed the unsophisticated tourists"

Related words...