dispensable Antonyms

indispensable litmus pressing prime primal primary principal quintessential required requisite substantive prerequisite pertinent main mandatory must necessary needed needful obligatory overriding parlous telling testing mandatorily Guatemala City nonelective unreplaceable unsatisfiable much needed absolutely essential badly needed absolutely necessary lifesaving life-or-death life-and-death topical urgent useful vital all important of the essence Bangui Kabul climactic very important active climatic compulsatory compulsory