essential

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