130 entries under changeable topic. ×

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frivolous(impulsive, unpredictable, indecisive, inconsistent)
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gay(lively, impulsive, unpredictable, explosive)
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iffy(adjective, fickle, volatile, changing)
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in the doldrums(expression, idiom, melancholy, unstable)
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indecisive
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irrepressible(lively, unpredictable)
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irresolute(indecisive, inconsistent)
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lighthearted(lively, unpredictable)
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lively(impulsive, unpredictable, explosive)
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mad(lively, unpredictable)
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melancholy(unstable, downcast)
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miserable(melancholy, unstable, ridiculous, pitiful)
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moping(melancholy, unstable, downcast)
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offended
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pensive(melancholy, unstable, downcast)
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protean(adjective, fickle, volatile, changing)
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resilient(lively, impulsive, unpredictable, explosive)
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shifting(adjective, fickle, volatile, changing)
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short-fuse(lively, unpredictable)
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sneaking(indecisive, inconsistent)
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APASmart Define. (2016). temperamental thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/temperamental/thesaurus/synonyms
ChicagoSmart Define. 2016. "temperamental thesaurus" https://smartdefine.org/temperamental/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, temperamental thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/temperamental/thesaurus/synonyms>.
MLASmart Define. "temperamental thesaurus" 28 March 2016. Web. 25 September 2026. <https://smartdefine.org/temperamental/thesaurus/synonyms>