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adjective
best, principal
Synonyms: capital, cardinal, chief, crackerjack, dominant, excellent, fab, first, first-class, greatest, heavy, highest, hot, leading, main, number one, paramount, primo, state-of-the-art, stellar, top, top-of-the-line, tough, world-class
Antonyms: inferior, least, minor, secondary, second-rate, subordinate, worst
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adjective
earliest
Synonyms: aboriginal, beginning, direct, first, firsthand, immediate, initial, original, pioneer, primal, primeval, primitive, primordial, pristine
Antonyms: final, latest
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adjective
basic, fundamental
Synonyms: basal, beginning, bottom, central, elemental, elementary, essential, first, foundational, introductory, meat-and-potatoes, original, primitive, principal, radical, rudimentary, simple, three R’s, ultimate, underivative, underived, underlying
Antonyms: auxiliary, secondary, supplemental