86 entries under big topic. ×

2
sober(adjective, energetic, heavy, substantial)
2
super(adjective, good, extraordinary, unusual)
2
worthwhile(adjective, strong, solid, important)
1
definite(adjective, superior, energetic, unusual)
1
determining(important, substantial, serious, valuable)
1
doozie(important, outstanding, substantial, large)
1
dynamite(important, substantial, large)
1
exigent(adjective, great, heavy, important)
1
fab(important, substantial, large)
1
fat(adjective, heavy, important, substantial)
1
front-page(important, substantial, valuable, vital)
1
hefty(adjective, heavy, substantial, large)
1
massive(heavy, substantial, large, considerable)
1
mattering much(expression, substantial, valuable, vital)
1
mondo(important, substantial, large)
1
of moment(expression, important, substantial, valuable)
1
of note(expression, substantial, valuable, vital)
1
of substance(expression, substantial, valuable, vital)
1
ponderous(heavy, substantial, valuable, vital)
1
severe(adjective, tough, sharp, heavy)
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APASmart Define. (2016). significant thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/significant/thesaurus/synonyms
ChicagoSmart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, significant thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>.
MLASmart Define. "significant thesaurus" 4 March 2016. Web. 25 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms>