Unrefined and Undignified

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

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

Undignified adjective - Lacking dignity.

Unrefined and undignified are semantically related in crude topic. Sometimes you can use "Unrefined" instead an adjective "Undignified", if it concerns topics such as improper.