Synonyms of momentous

1 Syllable

chief, big

2 Syllables

heavy, urgent, well-done, big-deal, special, grave, big-gun, big-wheel, hot-dog, front-page, world-class, cogent, pointful, namest, vital, weighty, steller, chiefest, doozie, crucial, hotdog, namer, signal

3 Syllables

newsworthy, outstanding, important, notable, frontpage, emphatic, critical, pivotal, distingue, influential, eventful, nameable, celebrious, fateful, material, far-reaching, sobering, gilt-edged, hundred-proof, out-of-sight, bigtime, called-for, historic, epochal, distingué, substantial, bottom-line, earth-shaking, meaningful

4 Syllables

suasive, decisive, significant, earth-shattering, impressive, unamusing, bottomline, out-of-this-world, top-priority, necessary, consequential, high-profile, memorable, remarkable

5 Syllables

considerable, applicative