133 entries under big topic. ×

12
tidy(adjective, great, reasonable, important)
11
bulky(adjective, great, heavy, important)
11
huge(adjective, great, heavy, important)
11
valuable(adjective, great, important, significant)
10
heavy(adjective, give, strong, hard, great)
10
vast(adjective, great, important, significant)
9
earnest(adjective, importance, heavy, enthusiastic)
9
plentiful(adjective, give, great, important)
9
relevant(adjective, importance, significant, large)
9
voluminous(adjective, give, great, heavy)
8
enormous(adjective, great, awkward, huge)
8
principal(adjective, important, significant, large)
7
copious(adjective, give, great, full)
7
dense(adjective, set, strong, hard, tough)
7
extensive(adjective, great, significant, large)
6
full(adjective, great, heavy, enthusiastic)
6
worthwhile(adjective, good, important, significant)
5
bountiful(adjective, give, great, rich)
5
capacious(adjective, great, generous, sufficient)
5
gigantic(adjective, great, huge)
10 years ago|42k views|share |citing 
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>