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 meaningful meat and potatoes minimal minimalist more acute more crucial more helpful more natural more inborn more inborn more inbred more meaningful more needed more primary more primary more required more required more requisite more urgent most crucial most basic most fundamental most inbred most inborn most inborn most needed most minimal most requisite most required most required most primary most primary most urgent must-have native natural needed necessity necessary need newsworthy organic paradigmatic pivotal precondition prerequisites prerequisite prerequisite primary primary/prime primest primitive principal prototypal prototypic prototypical qualification radical real realest required/requisite requirement/requisite required requirement requisites requisites requisite rudimental rudiment sine qua non smallest staple state states substantive systemic typical typic underlying urgent virtual