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.