adj.: radical, prime, essential, fundamental, organic, primal, primary, rudimentary, seminal, ultimate, underlying, essential or necessary, of or from the root or base
Thesaurus Group
radical, basal, average, basilar, predominant, plain, trivial, only just sufficient, principal, essential, build basal, serving as a starting-point, generic, generic, Prime, ground sexual, sketchy, substantial constitutive, needed vital, grand, foremost, original, foremost, prime, firstly and most importantly, most important, vitally valuable, sequence unitary, embryonic, clear, overt, primitive, apparent, extreme, opening, Originally of, plain, outstanding, ancient, antediluvian, primitive, connate, from, ace, Outstanding, demonstrable, self-evident, self-explanatory, severe, telling, classic, coherent, careless, simple, upper, can stated, sensible