Added 10 October 2026 momentously adverb Categories: Describing WordsObscure Words adverb ! Definition from Wiktionary (CC BY-SA). More about momentously at Wordnik → Where our words come from → In a momentous manner. Related Words: unmomentouslymemorablyfamouslymagnificentlyremarkablysignificativelysensationallystupendouslyimportantlyillustriouslyspectacularlycrucially Back to today's word