important

1 having great meaning or lasting effect the discovery of penicillin was a very important event in the history of medicine Synonyms of important big, consequential, earthshaking, earth-shattering, eventful, historic, major, material, meaningful, momentous, monumental, much, significant, substantial, tectonic, weighty Words Related to important decisive, fatal, fateful, strategic; earnest, grave, heavy, serious, sincere; distinctive, exceptional, impressive, outstanding, prominent, remarkable; valuable, worthwhile, worthy; distinguished, eminent, great, illustrious, noble, notable, noteworthy, outstanding, preeminent, prestigious; famous, notorious, renowned; all-important, central, critical, crucial, essential, key, pivotal, seminal, vital Near Antonyms of important paltry, petty, worthless; anonymous, nameless, obscure, uncelebrated, unknown Antonyms of important inconsequential, inconsiderable, insignificant, little, minor, negligible, slight, small, trifling, trivial, unimportant

2 having great power or influence Rachel Carson was an important figure in the environmental movement Synonyms of important heavy, heavy-duty, influential, mighty, potent, powerful, puissant, significant, strong Words Related to important high-level, senior, top; able, capable, competent, effective, efficient; authoritarian, autocratic (also autocratical), despotic, dictatorial, magisterial, tyrannical (also tyrannic); celebrated, distinguished, dominant, eminent, famed, famous, great, illustrious, noble, notable, noteworthy, notorious, outstanding, preeminent, prestigious, prominent, renowned; dynamic, energetic, forceful, high-powered, robust, vigorous Near Antonyms of important feeble, flimsy, frail, infirm; anonymous, nameless, obscure, uncelebrated, unknown; incapable, incompetent, ineffective, inept, inexpert, unfit, unqualified, unskilled, unskillful Antonyms of important helpless, impotent, insignificant, little, powerless, unimportant, weak

3 having a feeling of superiority that shows itself in an overbearing attitude an important businessman who always expects special treatment wherever he goes Synonyms of important assumptive, bumptious, cavalier, chesty, haughty, highfalutin (also hifalutin), high-and-mighty, high-handed, high-hat, huffish, huffy, imperious, arrogant, lofty, lordly, masterful, overweening, peremptory, pompous, presuming, presumptuous, pretentious, self-asserting, self-assertive, sniffy, stiff-necked, supercilious, superior, toplofty (also toploftical), uppish, uppityWords Related to important authoritarian, bossy, dominant, dominating, domineering, magisterial, pontifical, pontificating; condescending, disdainful, patronizing; impertinent, impudent, saucy; snobbish, snobby, snooty; blusterous, blustery, boastful, bombastic, braggart, bragging, braggy, cocky, swaggering, vain, vainglorious; complacent, conceited, egocentric, egoistic (also egoistical), egotistic (or egotistical), hubristic, narcissistic, orgulous, prideful, proud, self-affected, self-applauding, self-centered, self-complacent, self-conceited, self-pleased, self-satisfied, smug, stuck-up; self-flattering, self-loving, self-promoting; brash, forward, uninhibited, unreserved; extroverted (also extraverted), immodestNear Antonyms of important bashful, cowering, cringing, demure, diffident, introverted, mousy (or mousey), overmodest, self-critical, self-doubting, sheepish, shrinking, shy, subdued, timid; acquiescent, compliant, deferential, meek, passive, submissive, unaggressive, unassertive, unassuming, unobtrusive, yielding; quiet, reserved, retiringAntonyms of important humble, lowly, modest, unarrogant, unpretentious

4 having too high an opinion of oneself oh, you're so important—you think the world revolves around you Synonyms of important assured, biggety (or biggity) [Southern & Midland], bigheaded, complacent, consequential, egoistic (also egoistical), egotistic (or egotistical), conceited, overweening, pompous, prideful, proud, self-conceited, self-important, self-opinionated, self-satisfied, smug, stuck-up, swellheaded, vain, vaingloriousWords Related to important blusterous, blustery, boastful, bombastic, braggart, bragging, braggy, cocky, swaggering; arrogant, assumptive, bumptious, cavalier, chesty, disdainful, fastuous, haughty, high-and-mighty, high-hat, huffy, lofty, lordly, masterful, peremptory, pontifical, self-asserting, self-assertive, snobbish, snobby, snooty, supercilious, superior, toplofty (also toploftical), uppish, uppity; domineering, high-handed, imperious; highfalutin (also hifalutin), holier-than-thou, pretentious; overconfident, presuming, presumptuous; confident, self-assured, self-confident; self-adulatory, self-congratulatory, self-contented, self-gratulatory; self-applauding, self-dramatizing, self-glorifying, self-promoting; self-affected, self-centered, self-engrossed, selfish; condescending, patronizingNear Antonyms of important diffident, self-critical, self-distrustful, self-doubting, self-reproachful, self-reproving; meek, timid, unassertive; down-to-earth, unarrogant, unassuming, unpretentious; bashful, demure, introverted, mousy (or mousey), overmodest, retiring, sheepish, shrinking, shyAntonyms of important egoless, humble, modest, uncomplacent