Underivative and Underived

Underivative adjective - Not derivative or imitative.

Underived and underivative are semantically related in ancient topic. In some cases you can use "Underived" instead an adjective "Underivative", when it comes to topics like basic, earliest.

Underived adjective - Not derived; primary or simple.

Underivative and underived are semantically related in ancient topic. Sometimes you can use "Underivative" instead an adjective "Underived", if it concerns topics such as basic, earliest.