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

66 entries under adjective topic. ×

1
footling
1
frivolous
1
imaginary(fictitious, invented)
1
impalpable(unsubstantial, intangible)
1
impoverished
1
light
1
mental
1
niggling
1
nugatory
1
poor
1
thin
1
unessential
1
useless
1
vain
1
waiflike
0
dependent(importance, valuable, main, notable)
0
fractional
0
hollow
0
inappreciable
0
indifferent
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APASmart Define. (2016). substantial thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/substantial/thesaurus/antonyms
ChicagoSmart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2016, substantial thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/substantial/thesaurus/antonyms>.
MLASmart Define. "substantial thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/substantial/thesaurus/antonyms>