81 entries under unpredictable topic. ×

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giddy(impulsive, unreliable, changeable, erratic)
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hot-blooded(impulsive, explosive)
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hot-tempered(impulsive, explosive)
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impermanent(impulsive, explosive)
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imponderable(impulsive, explosive)
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inconsistent(impulsive, unreliable, changeable, erratic)
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irregular(lively, changeable)
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mad(lively, changeable)
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mobile(lively, changeable)
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momentary(impulsive, explosive)
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movable(lively, changeable)
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short-fuse(lively, changeable)
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short-lived(impulsive, explosive)
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subtle(impulsive, explosive)
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transient(impulsive, explosive)
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transitory(impulsive, explosive)
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unreliable(changeable, variable, erratic)
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unsettled(impulsive, explosive)
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up-and-down(lively, impulsive, changeable, explosive)
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vaporous(impulsive, explosive)
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APASmart Define. (2015). effervescent thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/effervescent/thesaurus/synonyms
ChicagoSmart Define. 2015. "effervescent thesaurus" https://smartdefine.org/effervescent/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, effervescent thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/effervescent/thesaurus/synonyms>.
MLASmart Define. "effervescent thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/effervescent/thesaurus/synonyms>