- Definitions|0
- Thesaurus|54
- Abbreviations|0
| baseless | |
| groundless | |
| unsupported | |
| empty | |
| fabricated(adjective, false, untrue, illogical, deceptive) | |
| fallacious(adjective, false, unreasonable, unsound, untrue) | |
| gossamery | |
| ill-founded | |
| mendacious(adjective, false, untrue, illogical, deceptive) | |
| misleading(adjective, false, untrue, illogical, deceptive) | |
| spurious(adjective, false, unreasonable, unsound, untrue) | |
| trumped up(expression, adjective, false, untrue, illogical) | |
| unfounded | |
| unjustified | |
| unproven(adjective, false, untrue, illogical, deceptive) | |
| unreal(adjective, negative, untrue, illogical, absent) | |
| unsound | |
| unsustainable | |
| untruthful(adjective, false, untrue, illogical, deceptive) | |
| unwarranted |
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| APA | Smart Define. (2015). without foundation thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/without_foundation/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "without foundation thesaurus" https://smartdefine.org/without_foundation/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, without foundation thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/without_foundation/thesaurus/synonyms>. |
| MLA | Smart Define. "without foundation thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/without_foundation/thesaurus/synonyms> |