66 entries under unlikely topic. ×
| not sensible(expression, adjective, silly, impractical) | |
| out of this world(expression, adjective, idiom, fantastic, imaginary) | |
| silly(adjective, impractical, unreal, idealistic) | |
| theoretical(adjective, silly, impractical, idealistic) | |
| unbelievable(adjective, fantastic, imaginary, whimsical) | |
| unworkable(adjective, silly, impractical, unreal) |
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| APA | Smart Define. (2015). blue sky thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/blue_sky/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "blue sky thesaurus" https://smartdefine.org/blue_sky/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, blue sky thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/blue_sky/thesaurus/synonyms>. |
| MLA | Smart Define. "blue sky thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/blue_sky/thesaurus/synonyms> |