Definition of mercurial:
- A person having mercurial qualities.
- A preparation containing mercury.
- Caused by the use of mercury; as, mercurial sore mouth.
- Having the form or image of Mercury; - applied to ancient guideposts.
- Having the qualities fabled to belong to the god Mercury; swift; active; sprightly; fickle; volatile; changeable; as, a mercurial youth; a mercurial temperament.
- Of or pertaining to, or containing, mercury; as, mercurial preparations, barometer. See Mercury, 2.
change, freakish, changeful, uncertain, unpredictable, inconsistent, capricious, fantastical, fluctuating, erratic, continue, temperamental, whimsical, quicksilver, ticklish, irregular, fickle, changeable, fantastic.
changeable (part of speech: adjective)
And Fullaway, active and mercurial though he was, made no attempt at conversation- he sat with knitted forehead, trying to think, to account, to surmise, only conscious that he was up against a bigger mystery than life had ever shown him up to then.- "The Rayner-Slade Amalgamation", J. S. Fletcher.
- "Sunk at Sea", R.M. Ballantyne.
- "The Mystery of The Barranca", Herman Whitaker.