Synonyms for Momentous:
earthshaking, big, considerable, eminent, fundamental, notable, influential, noteworthy, pivotal, prominent, vital, important, heavyweight, salient, big-wig, big-name, consequential, central, crucial, grave, high-powered, distinguished, key, world-shaking, critical, serious.
•important; serious (adjective)
weighty, big, heavy, consequential, notable, significant, fateful, considerable, vital, pivotal, critical, crucial, grave.
n.heavy, earnest, weighty, severe. fateful, decide, fatal. •momentous (noun)
significant, big, important.
Usage examples for momentous
They are too momentous to be treated with indifference. – Twenty-Four Short Sermons On The Doctrine Of Universal Salvation by John Bovee Dods