28 entries under extensive topic. ×

16
ample(adjective, adverb, great, reasonable, fair)
16
substantial(adjective, great, reasonable, fair, big)
11
voluminous(adjective, open, great, big, substantial)
9
spacious(adjective, great, substantial, large)
8
vast(adjective, open, great, big, large)
6
capacious(adjective, great, substantial, large)
6
huge(adjective, great, big, full, significant)
6
immense(adjective, open, great, big, large)
5
comprehensive(adjective, great, big, substantial, large)
5
enormous(adjective, great, big, full, large)
4
generous(adjective, great, fair, big, important)
4
roomy(adjective, great, space, large, huge)
4
sound(adjective, strong, solid, big, important)
4
wide(adjective, open, great, big, substantial)
3
broad(adjective, open, great, big, large)
2
solid(adjective, strong, big, important, enthusiastic)
2
strong(adjective, solid, big, important, enthusiastic)
1
comfortable(adjective, open, significant, substantial, large)
1
commodious(open, substantial, large, huge)
1
extended(open, big, large, grand, comfortable)
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APASmart Define. (2016). sizable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/sizable/thesaurus/synonyms
ChicagoSmart Define. 2016. "sizable thesaurus" https://smartdefine.org/sizable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, sizable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/sizable/thesaurus/synonyms>.
MLASmart Define. "sizable thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/sizable/thesaurus/synonyms>