Thesaurus

mercurial

adjective

Synonym Discussion of mercurial

inconstant, fickle, capricious, mercurial, unstable mean lacking firmness or steadiness (as in purpose or devotion). inconstant implies an incapacity for steadiness and an inherent tendency to change.
    • an inconstant friend
fickle suggests unreliability because of perverse changeability and incapacity for steadfastness.
    • performers discover how fickle fans can be
capricious suggests motivation by sudden whim or fancy and stresses unpredictability.
    • an utterly capricious critic
mercurial implies a rapid changeability in mood.
    • made anxious by her boss's mercurial temperament
unstable implies an incapacity for remaining in a fixed position or steady course and applies especially to a lack of emotional balance.
    • too unstable to hold a job


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