Definition of important:
in-chief, useful, chief, cardinal, crucial, profound, conspicuous, momentous, obscure, world-shaking, evidentiary, urgent, monumental, fundamental, copernican, epochal, epoch-making, noble, polar, extraordinary, paramount, distinguished, primal, marked, strategic, first-class, central, of the essence, grievous, evidential, trivial, noted, measurable, essential, classic, classical, far-reaching, primary, extensive, world-shattering, smash, dignified, eminent, boss, burning, necessary, historic, meaning, imposing, top, distinctive, of import, pregnant, relevant, probative, determining, high-ranking, portentous, all-important, big, pivotal, authoritative, exigent, key, earthshaking, life-and-death, ponderous, influential, weighty, vital, prestigious, foremost, main, of value, big-league, superior, famous, decisive, imperative, outstanding, eventful, life-or-death, inconsequential, authorised, prodigious, major, honored, operative, consequential, affect, heavy, large, signal, remarkable, valuable, standout, principal, illustrious, definitive, pressing, talented, unknown, authorized, aristocratic, noteworthy, critical, most-valuable, head, alpha, grave, great, well-known, immodest, serious, arch, grand.
- important (part of speech: adjective)
- authoritative (part of speech: adjective)
- influential (part of speech: adjective)
- relevant (part of speech: adjective)
- substantial (part of speech: adjective)