Synonyms and Antonyms of momentous
- a momentous occasion that will go down in the history books
decisive, fatal, fateful, strategic
earnest, grave, heavy, serious, sincere
distinctive, exceptional, impressive, outstanding, prominent, remarkable
distinguished, eminent, great, illustrious, noble, notable, noteworthy, outstanding, preeminent, prestigious
all-important, central, critical, crucial, essential, key, pivotal, seminal, vital