16
remarkable(adjective, clear, extraordinary, importance, unusual)
16
great(adjective, importance, important, famous, outstanding)
14
historic(adjective, importance, important, main, remarkable)
14
impressive(adjective, moving, importance, valuable, main)
14
influential(adjective, good, clear, great, importance)
14
powerful(adjective, good, clear, strong, intense)
14
relevant(adjective, clear, appropriate, importance, big)
13
signal(noun, adjective, clear, mark, great)
13
portentous(adjective, importance, valuable, main, notable)
13
prominent(adjective, good, clear, strong, solid)
12
pregnant(adjective, open, energetic, importance, sensitive)
12
appreciable(adjective, substantial, large, considerable, noticed)
12
chief(adjective, superior, big, unusual, important)
12
suggestive(adjective, characteristic, open, sensitive, meaning)
12
telling(verb, adjective, good, clear, strong)
11
essential(adjective, importance, big, important, original)
10
conspicuous(adjective, clear, solid, extraordinary, big)
10
goodly(adjective, comfort, rich, well, convenient)
10
meaning(adjective, show, express, imagination, meaningful)
10
special(adjective, superior, unusual, important, strange)
10 years ago|34k views|share |citing 
APASmart Define. (2016). significant thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/significant/thesaurus/synonyms
ChicagoSmart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, significant thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>.
MLASmart Define. "significant thesaurus" 4 March 2016. Web. 22 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms>