volatile [adjective]: quickly changing; fickle, unpredictable.
Example: His subordinates feared his volatile temper.
Related words: volatileness [noun], volatility [noun]
Synonyms: capricious, changeable, elastic, erratic, explosive, fickle, fitful, flighty, inconsistent, inconstant, inflammatory, irregular, mercurial, temperamental, unstable, unsteady, variable, whimsical
Antonyms: calm, constant, firm, fixed, reliable, resolute, set, stable, steadfast, steady, unchangeable, unvarying, unwavering
Tags: GRE
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