- Definitions|2
- Thesaurus|1.9k
- Abbreviations|0
52 entries under implausible topic. ×
| flimsy(adjective, strong, light, weak, great) | |
| weak(adjective, dull, strong, light, great) | |
| thin(adjective, dull, light, weak, great) | |
| unbelievable(adjective, extraordinary, strange, unreasonable, fantasy) | |
| fanciful(adjective, light, gentle, strange, fantasy) | |
| incredible(adjective, extraordinary, strange, unreasonable, fantasy) | |
| unconvincing(adjective, thin, extraordinary, strange, unreasonable) | |
| improbable(adjective, thin, extraordinary, strange, unreasonable) | |
| inconceivable(adjective, thin, extraordinary, belief, unreasonable) | |
| rare(adjective, fine, thin, extraordinary, strange) | |
| absurd(adjective, irrational, unbelievable, improbable) | |
| doubtful(extraordinary, unreasonable, amazing, dubious, unlikely) | |
| dubious(extraordinary, unreasonable, amazing, doubtful, unlikely) | |
| preposterous(adjective, extraordinary, amazing, irrational) | |
| strange(adjective, extraordinary, fantasy, unreal, unbelievable) | |
| uncertain(adjective, feeble, doubtful, hesitant, sluggish) | |
| unconceivable(adjective, likely) | |
| beyond belief(expression, extraordinary, amazing, incredible) | |
| far-fetched(extraordinary, amazing, doubtful, unlikely) | |
| fishy(adjective, weak, great, delicate, extraordinary) |
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| APA | Smart Define. (2016). unsubstantial thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, unsubstantial thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>. |
| MLA | Smart Define. "unsubstantial thesaurus" 30 March 2016. Web. 23 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms> |