【Inherent】 , 【ingrained】 ,  【intrinsic】 ,  【essential】 ,  【constitutional】  mean being a part, element, or quality of a thing's internal character or inmost being.

Something is  【inherent】 which is so deeply infixed in a thing that it is apparently part of its very nature or essence.

Something is  【ingrained】 which seems to be wrought into the fiber or texture of a person's being.

Something is  【intrinsic】 which belongs to or is a property of a thing itself, as considered apart from all the external relations, connections, or conditions that affect its usefulness, value, or significance.

Something is  【essential】  (see also  【ESSENTIAL】 2 NEEDFUL ) which is an element of a thing's essence and therefore indissolubly involved in its very nature or being.

Something is  【constitutional】 which is 【inherent】 in the fundamental makeup of the body or mind.