- Definitions|2
- Thesaurus|1.9k
- Abbreviations|0
116 entries under adjective topic. ×
| unsubstantiated | |
| bottomless(reason, false, true, senseless) | |
| chimerical(reason, justification) | |
| illusory(reason, justification) | |
| imaginary(reason, justification) | |
| uncalled-for(reason, false, useless, senseless) | |
| absurd(foolish, unreasonable, irrational, illogical) | |
| insupportable(defended, verbal attack) | |
| irrational(foolish, unreasonable, illogical, defended) | |
| ridiculous(foolish, unreasonable, illogical, defended) | |
| sophistic(foolish, unreasonable, irrational, illogical) | |
| specious(foolish, unreasonable, irrational, illogical) | |
| speculative | |
| vain(false, empty, worthless, untrue) | |
| apocryphal | |
| causeless(reason, useless, senseless, unwarranted) | |
| dead | |
| erroneous | |
| hypothetical | |
| ill-founded |
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| APA | Smart Define. (2015). groundless thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/groundless/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "groundless thesaurus" https://smartdefine.org/groundless/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, groundless thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/groundless/thesaurus/synonyms>. |
| MLA | Smart Define. "groundless thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/groundless/thesaurus/synonyms> |