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Definition of mercurial:

  1. A person having mercurial qualities.
  2. A preparation containing mercury.
  3. Caused by the use of mercury; as, mercurial sore mouth.
  4. Having the form or image of Mercury; - applied to ancient guideposts.
  5. Having the qualities fabled to belong to the god Mercury; swift; active; sprightly; fickle; volatile; changeable; as, a mercurial youth; a mercurial temperament.
  6. Of or pertaining to, or containing, mercury; as, mercurial preparations, barometer. See Mercury, 2.

Synonyms:

change, freakish, changeful, uncertain, unpredictable, inconsistent, capricious, fantastical, fluctuating, erratic, continue, temperamental, whimsical, quicksilver, ticklish, irregular, fickle, changeable, fantastic.

Usage examples: