Antonyms of adj momentous

1 sense of momentous

Sense 1
momentous -- (of very great significance; "deciding to drop the atom bomb was a very big decision"; "a momentous event")

INDIRECT (VIA significant) -> insignificant, unimportant -- (devoid of importance, meaning, or force)

Similarity of adj momentous

1 sense of momentous

Sense 1
momentous -- (of very great significance; "deciding to drop the atom bomb was a very big decision"; "a momentous event")
       => significant (vs. insignificant), important -- (important in effect or meaning; "a significant change in tax laws"; "a significant change in the Constitution"; "a significant contribution"; "significant details"; "statistically significant")