inessential Antonyms

essential intrinsic plasmic precondition prerequisite pressing primal primary principal required requirement requisite staple pertinent parlous organic key main mainstay major mandatary mandatory must necessary necessity needed needful obligatory structural substantive tectonic biogenic life-and-death life-or-death lifesaving mandatorily Guatemala City no-frills hot potato semantic sought after symbiotic unsatisfiable climactic Kabul meat and potatoes telling urgent virtual vital