43 entries under adjective topic. ×
| impossible | |
| unworkable | |
| futile | |
| unfeasible | |
| impracticable | |
| impractical | |
| hopeless | |
| inconceivable | |
| incredible | |
| infeasible | |
| ridiculous | |
| unachievable | |
| unattainable | |
| unlikely | |
| unrealistic | |
| unreasonable | |
| useless | |
| improbable | |
| abject | |
| abysmal |
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| APA | Smart Define. (2016). viable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/viable/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "viable thesaurus" https://smartdefine.org/viable/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, viable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/viable/thesaurus/antonyms>. |
| MLA | Smart Define. "viable thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/viable/thesaurus/antonyms> |