|part of speech:
||of very great significance or importance.
The assassination of Martin Luther King was a momentous event in US history.
- critical, crucial, eventful, fateful, grave, major, pivotal, significant
- insignificant, petty, trivial
- similar words:
- big, climacteric, earthshaking, fatal, great, important, serious, special, vital, weighty
||critical, heavy, landmark, memorable, notable, noteworthy, pivotal, significant, substantial
||momentously (adv.), momentousness (n.)