Synonyms|607Antonyms|112|Broader|9Narrower|11Related|650

39 entries under idiom topic. ×

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hard to believe(expression, unbelief doubt)
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impossible action
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is impossible
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labor in vain(expression, inutility)
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lash the waves(expression, inutility)
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milk the ram(expression, inutility)
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not acceptable
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not welcome
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on cloud nine(expression, unlikely, dreamy, optimistic)
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open to suspicion(expression, unbelief doubt)
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pie in the sky(expression, ideal, imaginary, lofty)
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run one hard(expression, difficulty)
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seek after impossibilities(expression, inutility)
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sow the sand(expression, inutility)
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strive after impossibilities(expression, inutility)
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too late(expression, inutility)
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try one's patience(expression, difficulty)
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undeserving of belief(expression, unbelief doubt)
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use vain efforts(expression, inutility)
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APASmart Define. (2016). impossible thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impossible/thesaurus/synonyms
ChicagoSmart Define. 2016. "impossible thesaurus" https://smartdefine.org/impossible/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, impossible thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impossible/thesaurus/synonyms>.
MLASmart Define. "impossible thesaurus" 9 March 2016. Web. 23 September 2026. <https://smartdefine.org/impossible/thesaurus/synonyms>