essential

acute barest base basic basis bare binding born bottom line built-in burning cardinal central characteristics characteristic characteristic condition considerable constitutional constituent constituent cornerstone crucial elementary fundamental helpful high inborn/inbred imperative important indispensable inborn indigenous inherent innate inner inner integral intimate intrinsic life-and-death littlest main mandatory material meaningful meat and potatoes minimal minimalist more acute more crucial more helpful more inborn more inborn more inbred more meaningful more natural more needed more primary more primary more requisite more required more required more urgent most crucial most basic most inborn most inborn most fundamental most inbred most needed most minimal most required most required most primary most primary most requisite most urgent must-have natural native needed necessity necessary need newsworthy organic paradigmatic pivotal precondition prerequisites prerequisite prerequisite primitive primary primary/prime primest principal prototypal prototypic prototypical qualification radical realest real requirement required/requisite requisite requisites requisites required requirement/requisite rudimental rudiment sine qua non smallest staple state states substantive systemic typical typic underlying urgent virtual