Synonyms of momentous in English:
a momentous decision
important, significant, epoch-making, historic, apocalyptic, headline, fateful, portentous, critical, crucial, vital, life-and-death, decisive, pivotal, serious, grave, weighty, consequential, big, great, far-reaching, life-changing, of importance, of moment, of significance, of consequence;
[Antonyms] unimportant, trivial, insignificant
momentous or momentary? See momentary
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