70 entries under substantial topic. ×

4
chief(adjective, great, big, heavy, important)
4
determining(adjective, big, important, significant)
4
meaningful(adjective, great, severe, important, significant)
4
portentous(adjective, big, heavy, significant)
3
heavyweight(adjective, great, big, heavy, important)
3
relevant(adjective, big, significant, valuable)
2
big(heavy, important, significant, valuable)
2
considerable(adjective, big, heavy, important, powerful)
2
exceptional(great, big, heavy, significant)
2
influential(adjective, great, big, important, powerful)
2
material(big, heavy, important, significant)
2
ponderous(big, heavy, significant, valuable)
2
salient(adjective, big, important, significant)
1
burdensome(tough, severe, big, heavy)
1
earnest(big, heavy, significant, valuable)
1
far-reaching(severe, big, important, significant)
1
fat(big, heavy)
1
front-page(great, big, heavy, significant)
1
importunate(adjective, big, important, significant)
1
marked(big, important, powerful, significant)
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APASmart Define. (2016). crucial thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/crucial/thesaurus/synonyms
ChicagoSmart Define. 2016. "crucial thesaurus" https://smartdefine.org/crucial/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, crucial thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/crucial/thesaurus/synonyms>.
MLASmart Define. "crucial thesaurus" 11 March 2016. Web. 29 September 2026. <https://smartdefine.org/crucial/thesaurus/synonyms>