66 entries under adjective topic. ×

3
meager(poor, small, inadequate, plentiful)
3
metaphysical(physical, obvious, presence)
3
minute
3
trivial
3
worthless
2
filmy(fragile, finespun)
2
fine
2
futile
2
inconsequential
2
infinitesimal
2
marginal
2
meaningless(reasonable, meaningful)
2
null
2
pointless
2
puny
2
slight
2
tenuous(weak, thin)
2
unreal
2
unsubstantial
1
exiguous
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APASmart Define. (2016). substantial thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/substantial/thesaurus/antonyms
ChicagoSmart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2016, substantial thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/substantial/thesaurus/antonyms>.
MLASmart Define. "substantial thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/substantial/thesaurus/antonyms>