Essential and Underived

Essential adjective - Impossible to do without.

Underived and essential are semantically related In some cases you can use "Underived" instead an adjective "Essential".

Nearby Words: essence, essentially, essentiality

Underived adjective - Not derived; primary or simple.

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