fundamental Synonyms

underlying primal cardinal rudimentary key central profound quiddity procreative principle principal primordial primogenial staple quintessential simple seminal scut rudimental rudiment riprap right-hand requisite radix radical primitive primeval obligatory nuclear nethermost needful needed necessary natal nascent milestone omphalic organic primary prime preparatory prenatal plasmic pivotal paramount overriding original middlemost stapler first harmonic