90
important(adjective, good, strong, great, tough)
51
substantial(adjective, strong, importance, big, heavy)
33
momentous(adjective, good, clear, strong, great)
31
serious(adjective, good, great, extraordinary, importance)
30
considerable(adjective, clear, importance, big, heavy)
30
weighty(adjective, good, clear, strong, great)
27
consequential(adjective, good, clear, importance, big)
25
notable(adjective, clear, great, solid, extraordinary)
23
critical(adjective, great, extraordinary, big, heavy)
23
crucial(adjective, great, tough, severe, extraordinary)
23
noteworthy(adjective, solid, extraordinary, big, unusual)
21
meaningful(adjective, good, clear, strong, show)
21
big(adjective, good, importance, heavy, important)
20
expressive(adjective, characteristic, strong, show, open)
20
vital(adjective, great, importance, big, heavy)
19
outstanding(adjective, clear, great, extraordinary, importance)
18
eloquent(adjective, strong, show, open, moving)
18
grave(adjective, great, tough, severe, importance)
18
major(adjective, great, tough, severe, superior)
18
material(adjective, good, appropriate, importance, big)
<1234510>
10 years ago|34k views|share |citing 
APASmart Define. (2016). Significant thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/significant/thesaurus/synonyms
ChicagoSmart Define. 2016. "Significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, Significant thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>.
MLASmart Define. "Significant thesaurus" 4 March 2016. Web. 20 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms>