1 advanced, forward, premature, untimely
2 primeval, primitive, primordial, undeveloped, young
3 ahead of time, beforehand, betimes (archaic) in advance, in good time, prematurely, too soon
2 developed, mature, ripe, seasoned
3 behind, belated, late, overdue, tardy
English Collins Dictionary - English synonyms & Thesaurus
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