Unrefined and Unhewn

Unrefined adjective - Being such as found in nature and not altered by processing or refining.

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

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

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