72 entries under adjective topic. ×

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improbable(silly, impractical, unlikely, idealistic)
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invented(fantastic, imaginary, unlikely, unbelievable)
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ivory-tower(silly, impractical, unlikely, unreal)
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nonrealistic(silly, impractical, unlikely, unreal)
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not sensible(expression, silly, impractical, unlikely)
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out of this world(expression, idiom, fantastic, imaginary)
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phantasm(illusive, hallucinatory, phantasmal)
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silly(impractical, unlikely, unreal, idealistic)
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theoretical(silly, impractical, unlikely, idealistic)
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unbelievable(fantastic, imaginary, unlikely, whimsical)
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unlikely(fantastic, imaginary, unbelievable, idealistic)
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unworkable(silly, impractical, unlikely, unreal)
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APASmart Define. (2015). blue sky thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/blue_sky/thesaurus/synonyms
ChicagoSmart Define. 2015. "blue sky thesaurus" https://smartdefine.org/blue_sky/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, blue sky thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/blue_sky/thesaurus/synonyms>.
MLASmart Define. "blue sky thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/blue_sky/thesaurus/synonyms>