135 entries under adjective topic. ×

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unattainable(unsound, unlikely)
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uncertain(easy, bright)
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undecided(weak, yielding)
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undetermined(weak, yielding)
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unfeasible(unsound, unlikely)
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unfixed(weak, yielding)
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unimportant(upset, light)
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unlikely
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unnatural
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unproficient(unsound, unlikely)
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unrealistic
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unreasonable
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unseasoned(unsound, unlikely)
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unsensible
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unserviceable(unsound, unlikely)
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unskilled(unsound, unlikely)
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unsound
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unstable
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untrained(unsound, unlikely)
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untrue(easy, bright)
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APASmart Define. (2013). hardboiled thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/hardboiled/thesaurus/antonyms
ChicagoSmart Define. 2013. "hardboiled thesaurus" https://smartdefine.org/hardboiled/thesaurus/antonyms (accessed September 29, 2026).
HarvardSmart Define 2013, hardboiled thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/hardboiled/thesaurus/antonyms>.
MLASmart Define. "hardboiled thesaurus" 18 May 2013. Web. 29 September 2026. <https://smartdefine.org/hardboiled/thesaurus/antonyms>