- Definitions|0
- Thesaurus|128
- Abbreviations|0
| baseless(adjective, poor, negative, untrue, vacant) | |
| groundless(adjective, poor, negative, error, unwarranted) | |
| unwarranted(adjective, right, reasonable) | |
| unfounded | |
| erroneous(adjective, bad, false, mad, unreasonable) | |
| fallacious(adjective, bad, wrong, poor, false) | |
| false(adjective, bad, poor, error, incorrect) | |
| flimsy(adjective, poor, negative, unwarranted, untrue) | |
| gratuitous | |
| ill-founded | |
| apocryphal(adjective, error) | |
| idle | |
| illogical(poor, mad, unreasonable, error, irrational) | |
| uncalled-for | |
| unreal(adjective, negative, mad, unreasonable, error) | |
| unsustainable | |
| beguiling(mad, unreasonable, irrational) | |
| bottomless | |
| built on sand(expression, idiom) | |
| causeless |
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| APA | Smart Define. (2015). ungrounded thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/ungrounded/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "ungrounded thesaurus" https://smartdefine.org/ungrounded/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, ungrounded thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/ungrounded/thesaurus/synonyms>. |
| MLA | Smart Define. "ungrounded thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/ungrounded/thesaurus/synonyms> |