4
earthshaking
4
efficacious(adjective, strong, important, powerful, useful)
4
elder(adjective, rank, post, status, age)
4
emphatic(adjective, open, sharp, importance, sensitive)
4
evident(adjective, clear, big, unusual, important)
4
evidentiary
4
indication(noun, feature, characteristic, information, mark)
4
informative(adjective, revealing, educational)
4
integral(adjective, importance, important, original, serious)
4
major-league(adjective, strong, great, extraordinary, unusual)
4
much(adverb, substantial, large)
4
of import(expression, adjective, idiom)
4
operative(adjective, active, useful, running, beneficial)
4
palpable(adjective, substantial, considerable)
4
persuasive(adjective, strong, moving, powerful, touching)
4
prime(adjective, good, important, original, essential)
4
sensible(adjective, good, big, substantial, definite)
4
sign(noun, information, mark, guide, hint)
4
solid(adjective, extraordinary, proper, exceptional, substantial)
4
strong(adjective, clear, open, intense, important)
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APASmart Define. (2016). significant thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/significant/thesaurus/synonyms
ChicagoSmart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, significant thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>.
MLASmart Define. "significant thesaurus" 4 March 2016. Web. 21 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms>