535 entries under adjective topic. ×

5
worthless(characteristic, quality, finance, banking)
4
agitated(upset, rough, violent, anxious)
4
alterable(change, changeable, changeableness)
4
alternating(variable, changing, changeableness, fluctuating)
4
ambiguous(delicate, uncertain, doubtful, unsettled)
4
borderline(delicate, uncertain, nervous, doubtful)
4
chancy(delicate, uncertain, doubtful, unsettled)
4
crazy(wrong, careless, foolish, stupid)
4
deviating(casual, variable, erratic, random)
4
dilapidated
4
eccentric(unusual, uncertain, irregular, unpredictable)
4
elastic(lively, impulsive, unpredictable, changeable)
4
ephemeral(short, limited, impulsive, unpredictable)
4
fallacious(false, foolish, unreasonable, ill)
4
fanciful(careless, unreasonable, unpredictable, changeable)
4
fleeting(present, short, limited, brief)
4
flexible(changeable, fickle, variable, volatile)
4
flickering(irregular, disturbed, changeable, variable)
4
flitting
4
fly-by-night(careless, loose, foolish, uncertain)
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APASmart Define. (2016). unstable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unstable/thesaurus/synonyms
ChicagoSmart Define. 2016. "unstable thesaurus" https://smartdefine.org/unstable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, unstable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unstable/thesaurus/synonyms>.
MLASmart Define. "unstable thesaurus" 26 February 2016. Web. 27 September 2026. <https://smartdefine.org/unstable/thesaurus/synonyms>