dispensable Antonyms

indispensable mandatory prime primal primary principal quintessential required requisite strategic structural pressing prerequisite must necessary needed needful obligatory overriding overruling parlous pertinent substantive 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 main active compulsatory