simple-minded

adjective
UK /ˌsɪm.pəlˈmaɪn.dɪd/
US /ˌsɪm.pəlˈmaɪn.dɪd/

A simple-minded person is not very smart and finds it hard to understand things.

The simple-minded man believed every story he was told.


OTHER MEANINGS

2. Not complicated; plain and easy to understand.

They lived a simple-minded life in the countryside.

3. Lacking deep thought or subtlety.

His simple-minded solution ignored the real problem.

4. Honest and without hidden motives.

She gave a simple-minded answer that everyone trusted.