- Definitions|2
- Thesaurus|1.9k
- Abbreviations|0
| meaningless(adjective, false, unreasonable, unimportant, trivial) | |
| otherworldly(adjective, excellent, gentle, strange, marvelous) | |
| phantasmal | |
| precarious | |
| rarefied(adjective, fine, thin, delicate, slim) | |
| thick(adjective, thin, extraordinary, unreasonable, amazing) | |
| unrealistic(adjective, unreal) | |
| unreliable(false, ill, insane, unhealthy, frail) | |
| worthless(adjective, weak, feeble, useless, trivial) | |
| wraithlike(adjective, heavenly, ghostly, incorporeal, nonmaterial) | |
| abstract(adjective, fantastic, unreal, insubstantial, theoretical) | |
| brittle(adjective, weak, delicate, feeble, infirm) | |
| delusionary | |
| evanescent | |
| fancied(adjective, strange, fantasy, unreal) | |
| fantastical(adjective, strange, fantasy, unreal) | |
| fine | |
| frivolous(weak, soft, gentle, content) | |
| groundless(error, unsubstantiality) | |
| inconsiderable(adjective, weak, soft, gentle, mild) |
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| APA | Smart Define. (2016). unsubstantial thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, unsubstantial thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>. |
| MLA | Smart Define. "unsubstantial thesaurus" 30 March 2016. Web. 25 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms> |