(adj): vs. unnecessary) -- (absolutely essential
(adj): vs. inessential) -- (basic and fundamental
(adj): of primary importance
(adj): essential for maintaining the fundamental life processes
(adj): prenominal), constitutional, constitutive(prenominal), organic -- (constitutional in the structure of something (especially your physical makeup)
(adj): prenominal) -- (highly recommended
(adj): prenominal) -- (characterized by the absence of inessential features
(adj): necessary or important, especially regarding food or commodities
(adj): having a firm basis in reality and being therefore important, meaningful, or considerable
(adj): prenominal) -- (existing in essence or effect though not in actual fact
(adj): performing an essential function in the living body
(adj): prenominal), all important(predicate), crucial, essential, of the essence(predicate) -- (of the greatest importance
(adj): vs. unimportant), of import -- (of great significance or value
(adj): being or relating to or containing the essence of a plant etc
(adj): vs. adjective), essential -- (defining rights and duties as opposed to giving the rules by which rights and duties are established
(n): anything indispensable
(n): a separate and self-contained entity
