Synonyms of significant

1 Syllable

sound, goer, chief, goest, rich

2 Syllables

big-deal, special, big-time, symptoms, facund, big-gun, big-wheel, hot-dog, cogent, tokens, stand-out, central, moving, pregnant, knowing, valid, index, trenchant, pointful, pithy, delphian, weighty, chiefest, centric, signal, heavy, pithier, token, helpful, serious, salient, meaning, namest, grass-roots, grassroots, maxi, vital, pithiest, axial, splasher, hotdog, namer, symptom, front-page

3 Syllables

important, indexing, frontpage, giveaway, relevant, centroidal, mind-bending, influential, big-league, indicant, symbolic, sobering, powerful, substantial, unusual, marrowy, newsworthy, emphatic, denoting, convincing, surveyable, weighable, signifier, momentous, sententious, life-or-death, indices, unwonted, conformant, compelling, telltale, gilt-edged, indexes, historic, bottom-line, earth-shaking, expressing, good-sized, indicial, eloquent, life-and-death, earthshaking, far-reaching, bigtime, deciding, short-and-sweet, forceful

4 Syllables

suasive, climacteric, oracular, evidential, earthshattering, appreciable, unamusing, symbolical, expressive, mensurable, assessable, quantifiable, bottomline, coal-and-ice, name-of-the-game, indications, evidence, evincive, measurable, indication, preponderant, necessary, all-important, earth-shattering, adumbration, symptomatic, monumental, suggestive, decisive, fundamental, noteworthy, substrative, remarkable

5 Syllables

unsurpassable, stimulative, operative, quantitative, unordinary, indicative, informational, prefiguration, revelatory, applicative, applicatory, unforgettable, informative, recognizable, ascertainable, indicatory, inspirational, axiological

6 Syllables

representative, significatory