foundational

base basement basic ground last primary radical underlying

basal lowermost lowest meat-and-potatoes nethermost rock-bottom undermost

secondary

highest top

elemental fundamental rudimentary straightforward underlying

ABCs abecedarian basal beginning child's play clear duck soup easy essential facile initial introductory meat and potatoes original plain prefatory preliminary primary primitive primo simplest simplex simplified substratal uncomplex uncomplicated

additional advanced extra secondary

abstruse complex complicated compound difficult hard intricate involved

central constitutional crucial elemental elementary essential indispensable integral intrinsic major necessary paramount principal radical significant structural theoretical underlying vital

bottom cardinal first key organic original primary prime primitive requisite supporting

axiological axiomatic basal bottom-line constitutive grassroots meat-and-potatoes primordial rudimentary substratal substrative sustaining underived

accessory auxiliary extrinsic inessential insignificant learned least lesser minor needless nonessential secondary trivial unimportant unnecessary

additional advanced extra subordinate

basal base basement basic ground last lowest meat-and-potatoes nethermost primary radical rock-bottom underlying undermost

basal base basement basic deepest ground last lowermost lowest meat-and-potatoes primary radical rock-bottom underlying undermost

basal beginning bottom central elemental elementary essential first introductory meat-and-potatoes original primitive principal radical rudimentary simple three R's ultimate underivative underived underlying

auxiliary latest least minor secondary supplemental

profound

basal bottom cardinal constitutional essential native natural organic original primary primitive

deep-seated inherent innate intrinsic meat-and-potatoes primal thoroughgoing underlying vital

inessential minor secondary unimportant

extrinsic nonessential superficial

ABCs abecedarian basal basic beginning child's play clear duck soup easy elemental essential facile fundamental initial introductory meat and potatoes original plain prefatory preliminary primary primitive primo rudimentary simplest simplex simplified straightforward substratal uncomplex uncomplicated underlying

basal base basement basic ground last lowermost lowest meat-and-potatoes nethermost primary radical rock-bottom underlying