Synonyms|1.4kAntonyms|650|Broader|15Narrower|0Related|2.9k

89 entries under important topic. ×

8
major(adjective, good, great, reasonable, fair)
8
principal(adjective, big, significant, large)
7
telling(adjective, strong, sound, reasonable)
6
extraordinary(adjective, significant, large, remarkable)
6
worthwhile(adjective, good, big, significant)
5
fundamental
4
forceful(adjective, strong, sound, tough, solid)
4
monumental(adjective, great, big, huge)
4
worthy
3
central(adjective, significant, vital, imperative)
3
crucial(adjective, big, heavy, significant)
3
heavyweight(adjective, big, heavy, significant)
3
intrinsic(adjective, physical, material, serious)
3
major-league(adjective, strong, powerful, significant)
2
critical(adjective, big, heavy, significant)
2
eventful(significant, historic)
2
fat(adjective, hard, great, big, heavy)
2
noteworthy(adjective, big, significant, large)
2
pivotal(significant, historic)
2
primary(big, significant, serious, valuable)
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APASmart Define. (2016). substantial thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/substantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, substantial thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/substantial/thesaurus/synonyms>.
MLASmart Define. "substantial thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/substantial/thesaurus/synonyms>