Thesaurus

Synonyms for Important include:

acute, all important, all-important, alpha, authoritative, basal, beta, big, biogenic, blue-chip, burning, cardinal, central, chief, conclusive, consequential, constituent, constitutional, constitutive, Copernican, critical, crucial, dangerous, deciding, decisive, desperate, determinant, determinative, determining, dire, disrespectful, distinguished, domineering, earthshaking, eminent, epoch-making, epochal, essential, eventful, evidential, evidentiary, expensive, fatal, fateful, fundamental, grand, grave, great, grievous, heavy, historic, immodest, important, in-chief, indispensable, influential, intrinsic, intrinsical, invaluable, key, large, life-and-death, life-or-death, life-sustaining, life-threatening, main, meaning, meaningful, measurable, meaty, momentous, monumental, most-valuable, must, necessary, no-frills, noteworthy, of import, of the essence, operative, organic, outstanding, overweening, peremptory, pivotal, polar, portentous, potent, powerful, precious, pregnant, prestigious, priceless, primal, primary, principal, probative, probatory, prodigious, profound, proud, purposeful, remarkable, rich, semiprecious, serious, severe, significant, staple, strategic, substantial, substantive, unexpendable, uppity, valuable, valued, virtual, vital, weighty, world-shaking, world-shattering, worth, worthy

important is a ADJ.