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Definition of important : 1. Bearing on; forcible; driving.
2. Carrying or possessing weight or consequence; of valuable content or bearing; significant; weighty.
3. Full of, or burdened by, import; charged with great interests; restless; anxious.
4. Importunate; pressing; urgent.

Synonyms:

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

important (part of speech: adjective)

eminent, distinguished, prominent, noteworthy, notable, big-wig, heavyweight, big-name, earthshaking, grave, serious, momentous, high-powered, critical, world-shaking, pivotal, salient, crucial

authoritative (part of speech: adjective)

authoritarian, masterful, consequential, potent, strong, arrogant, authoritative, imperious, influential, powerful, effectual, dictatorial, impressive, autocratic, commanding, effective

influential (part of speech: adjective)

ruling, predominant, senior, supreme, motivational, prejudicial, leading, controlling

relevant (part of speech: adjective)

related, relevant

substantial (part of speech: adjective)

material, firm, substantial, solid, significant, appreciable, palpable, actual, immanent, meaningful, tangible, real, physical, bodily, united, sturdy, substantive, considerable

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