578 entries under adjective topic. ×

9
decisive(great, extraordinary, big, important)
9
forceful(sharp, energetic, important, powerful)
9
key(importance, important, guide, original)
9
noticeable(clear, solid, extraordinary, unusual)
9
principal(good, great, big, important)
9
symbolic(representative, meaningful, telling, ominous)
8
sizeable(comfort, rich, well, convenient)
8
big-league(importance, valuable, main, notable)
8
central(important, original, essential, basic)
8
dominant(important, rank, post, status)
8
fateful(importance, valuable, main, notable)
8
indicative(characteristic, open, energetic, sensitive)
8
memorable(extraordinary, superior, unusual, important)
8
pivotal(important, serious, critical, vital)
8
purposeful(importance, valuable, main, notable)
8
significative(importance, valuable, main, notable)
8
striking(clear, open, energetic, outstanding)
8
superior(unusual, important, rank, exceptional)
7
compelling(clear, important, meaning, essential)
7
grand(importance, valuable, main, notable)
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APASmart Define. (2016). significant thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/significant/thesaurus/synonyms
ChicagoSmart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, significant thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>.
MLASmart Define. "significant thesaurus" 4 March 2016. Web. 23 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms>