100 entries under erratic topic. ×

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easily upset(expression, unpredictable, unreliable, fickle)
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from left field(expression, idiom, changeable, random)
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froward(unpredictable, unreliable, fickle, capricious)
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hotheaded(unpredictable, unreliable, fickle)
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hyper(unpredictable, unreliable, fickle, preoccupied)
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in bad mood(expression, idiom, unpredictable, unreliable, fickle)
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incalculable(irregular, unpredictable, unreliable, changeable)
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mean(unpredictable, unreliable, fickle)
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nobody home(expression, disturbed, unhinged)
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not all there(expression, idiom, disturbed, unhinged)
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orderless
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ornery(unpredictable, unreliable, fickle)
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passionate(unpredictable, unreliable, fickle, preoccupied)
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petulant(unpredictable, unreliable, changeable, fickle)
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thin-skinned(unpredictable, unreliable, fickle)
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unforeseeable(changeable, random)
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unmethodical(adjective, casual, random, wiggly)
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unscrewed(disturbed, preoccupied, unhinged, neurotic)
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willful(unpredictable, unreliable, fickle, capricious)
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without purpose(expression, random)
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APASmart Define. (2016). unstable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unstable/thesaurus/synonyms
ChicagoSmart Define. 2016. "unstable thesaurus" https://smartdefine.org/unstable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unstable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unstable/thesaurus/synonyms>.
MLASmart Define. "unstable thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/unstable/thesaurus/synonyms>