Unsophisticated (adjective)

1. Lacking sophistication or refinement in taste or manner.
2. Simple or unschooled in knowledge or skills.

Origin:

From the old french word 'sophistiquer' meaning 'to make complex'.

Examples:

1. His paintings had an unsophisticated charm that was very appealing.
2. Her approach to life was unsophisticated, but very effective.
3. The unsophisticated rural town had a charm of its own.
4. The unsophisticated design of the website was a selling point.
5. The unsophisticated gadget was very easy to use.