serving as an essential component; "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental to modern industrial structure"
Primal is used to describe something that relates to the origins of things or that is very basic. Jealousy is a primal emotion. primal feelings or actions seem to belong to a part of people's character that is ancient and animal-like (primalis, from primus; PRIME)
having existed from the beginning; in an earliest or original stage or state; "aboriginal forests"; "primal eras before the appearance of life on earth"; "the forest primeval"; "primordial matter"; "primordial forms of life"