Synonyms of momentous in English:

momentous

adjective

  • a momentous decision
    [Antonyms] unimportant trivial insignificant
  • momentous or momentary? See momentary

    Definition of momentous in:

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    Word of the day flippant
    Pronunciation: ˈflɪp(ə)nt
    adjective
    not showing a serious or respectful attitude