37 entries under significant topic. ×

6
big(adjective, great, informal, heavy, important)
6
considerable(adjective, big, heavy, important)
6
major-league(adjective, great, extraordinary, important)
4
consequential(adjective, big, heavy, important)
4
important(adjective, great, big, heavy, important)
4
momentous(adjective, big, heavy, important, outstanding)
4
substantial(adjective, big, heavy, important)
3
bulky(adjective, big, heavy, substantial)
2
abundant(adjective, heavy, large, considerable)
2
ample(adjective, heavy, large, considerable)
2
key(large, considerable)
2
large(adjective, heavy, huge, considerable)
2
material(big, heavy, substantial, large)
1
durable(adjective, large, considerable)
1
extensive(large, considerable)
1
extraordinary(great, outstanding, large, notable)
1
generous(adjective, large, considerable)
1
meaningful(great, big, heavy, important)
1
memorable(adjective, noteworthy)
1
sizable(large, considerable)
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APASmart Define. (2016). heavyweight thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/heavyweight/thesaurus/synonyms
ChicagoSmart Define. 2016. "heavyweight thesaurus" https://smartdefine.org/heavyweight/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, heavyweight thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/heavyweight/thesaurus/synonyms>.
MLASmart Define. "heavyweight thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/heavyweight/thesaurus/synonyms>