Unpolished and Unhewn

Unpolished adjective - Lacking in refinement or good taste.

Unhewn and unpolished are semantically related In some cases you can use "Unhewn" instead an adjective "Unpolished".

Unhewn adjective - (of stone especially) not given a finished form by or as if by hewing.

Unpolished and unhewn are semantically related in crude topic. You can use "Unpolished" instead an adjective "Unhewn", if it concerns topics such as rough, basic.