He has mercurial temperment.
His mercurial disposition ultimately displaced him from his advisory posting.
The boys anger was mercurial I had to tackle him down.
Mercurial is mood swings: The mercurial patient had mood swings frequently.
We bought a mercurial barometer to help predict the weather.Her mercurial temperment made her an exciting actress to watch.It is hard to find a mercurial thermometer any more.
His mercurial behavior prevented him from holding on to any new employment for more than a few weeks.
Her mercurial personality made it difficult to predict her moods and actions.
Mercurial and mercury
The hail storm proved to be quite tempestuous. His wildly mercurial mood swings make his temper dangerously tempestuous. Our romance was short-lived but tempestuous.
An antonyms of mercurial is unchanging.
Mercurial was created on 2005-04-19.
Mercurial Manoeuvres was created in 2000.
Having the qualities fabled to belong to the god Mercury; swift; active; sprightly; fickle; volatile; changeable; as, a mercurial youth; a mercurial temperament., Having the form or image of Mercury; -- applied to ancient guideposts., Of or pertaining to Mercury as the god of trade; hence, money-making; crafty., Of or pertaining to, or containing, mercury; as, mercurial preparations, barometer. See Mercury, 2., Caused by the use of mercury; as, mercurial sore mouth., A person having mercurial qualities., A preparation containing mercury.