| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | elementary, fundamental |
| Synonyms: | basal, capital, central, chief, elemental, essential, indispensable, inherent, intrinsic, key, main, necessary, primary, primitive, principal, radical, substratal, underlying, vital |
| Antonyms: | additional, extra, inessential, nonessential, outside, peripheral, secondary |
| Main Entry: | essential |
| Part of Speech: | adjective |
| Definition: | basic, fundamental |
| Synonyms: | absolute, basal, cardinal, cold, complete, congenital, connate, constitutional, deep-seated, elemental, elementary, ideal, inborn, inbred, inherent, innate, intrinsic, key, main, material, meat and potatoes, name of the game, nitty-gritty, nub, perfect, primary, prime, primitive, principal, quintessential, substratal, underlying |
| Notes: | the words crucial, essential, and vital cannot be qualified (cannot be more or less...) |
| Antonyms: | atypical, minor, secondary |
| Main Entry: | fundamental |
| Part of Speech: | adjective |
| Definition: | basic, important |
| Synonyms: | axiological, axiomatic, basal, bottom, bottom-line, cardinal, central, constitutional, constitutive, crucial, elemental, elementary, essential, first, foundational, grass-roots, indispensable, integral, intrinsic, key, major, meat-and-potatoes, necessary, organic, original, paramount, primary, prime, primitive, primordial, principal, radical, requisite, rudimentary, significant, structural, substratal, substrative, supporting, sustaining, theoretical, underived, underlying, vital |
| Antonyms: | additional, advanced, auxiliary, extra, minor, secondary, subordinate, trivial, unimportant |
| Main Entry: | primitive |
| Part of Speech: | adjective |
| Definition: | ancient, original |
| Synonyms: | archaic, basic, earliest, early, elementary, essential, first, fundamental, old, primal, primary, primeval, primordial, pristine, substratal, underivative, underived, underlying, undeveloped, unevolved |
| Antonyms: | current, modern, new, present |
| Main Entry: | underlying |
| Part of Speech: | adjective |
| Definition: | fundamental, latent |
| Synonyms: | basal, basic, bottom, bottom-line, cardinal, concealed, critical, crucial, elemental, elementary, essential, hidden, indispensable, intrinsic, lurking, necessary, needful, nitty-gritty, nub, primary, prime, primitive, radical, root, substratal, veiled, vital |
| Antonyms: | secondary |
| Main Entry: | rudimental |
| Part of Speech: | adjective |
| Definition: | elementary |
| Synonyms: | ABCs, abecedarian, basal, basic, beginning, child's play, clear, duck soup, easy, elemental, essential, facile, foundational, fundamental, initial, introductory, meat and potatoes, original*, plain, prefatory, preliminary, primary, primitive, primo, rudimentary, simplest, simplex, simplified, straightforward, substratal, uncomplex, uncomplicated, underlying |