essential

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