mercurial

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mer·cu·ri·al

 (mər-kyo͝or′ē-əl)
adj.
1. often Mercurial
a. Roman Mythology Of or relating to the god Mercury.
b. Astronomy Of or relating to the planet Mercury.
2. Having the characteristics of eloquence, shrewdness, swiftness, and thievishness attributed to the god Mercury.
3. Containing or caused by the action of the element mercury.
4. Quick and changeable in temperament; volatile: a mercurial nature.
n.
A pharmacological or chemical preparation containing mercury.

[Middle English, of the planet Mercury, from Latin mercuriālis, of the god or planet Mercury, from Mercurius, Mercury.]

mer·cu′ri·al·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

mercurial

(mɜːˈkjʊərɪəl)
adj
1. (Elements & Compounds) of, like, containing, or relating to mercury
2. volatile; lively: a mercurial temperament.
3. (Astronomy) (sometimes capital) of, like, or relating to the god or the planet Mercury
n
(Medicine) med any salt of mercury for use as a medicine
[C14: from Latin mercuriālis]
merˈcurially adv
merˈcurialness, merˌcuriˈality n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

mer•cu•ri•al

(mərˈkyʊər i əl)
adj.
1. changeable; fickle; flighty; erratic: a mercurial nature.
2. animated; lively; sprightly.
3. pertaining to, containing, or caused by the metal mercury.
4. (cap.) of or pertaining to the god Mercury.
5. (cap.) of or pertaining to the planet Mercury.
[1350–1400; Middle English < Latin]
mer•cu′ri•al•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.mercurial - liable to sudden unpredictable changemercurial - liable to sudden unpredictable change; "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next"
changeful, changeable - such that alteration is possible; having a marked tendency to change; "changeable behavior"; "changeable moods"; "changeable prices"
2.mercurial - relating to or under the (astrological) influence of the planet MercuryMercurial - relating to or under the (astrological) influence of the planet Mercury; "the Mercurial canals"
3.mercurial - relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god MercuryMercurial - relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god Mercury; "more than Mercurial thievishness"
4.mercurial - relating to or containing or caused by mercurymercurial - relating to or containing or caused by mercury; "mercurial preparations"; "mercurial sore mouth"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

mercurial

Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002

mercurial

adjective
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Translations

mercurial

[mɜːˈkjʊərɪəl] ADJ
1. (Chem) → mercúrico, mercurial
2. (= lively) → vivo; (= changeable) → veleidoso, voluble
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

mercurial

[mɜːrˈkjʊəriəl] adj [person, temperament] → changeant(e)
Collins English/French Electronic Resource. © HarperCollins Publishers 2005

mercurial

adj
(Chem: = containing mercury) → quecksilberhaltig
(fig) (= volatile)sprunghaft, wechselhaft; (= lively)quicklebendig
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

mercurial

[mɜːˈkjʊərɪəl] adj (unpredictable) → volubile
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in classic literature ?
You are too mercurial - you disclose all my emotions.
They have neither the matured and systematically trained powers of the Polygonal Bachelors and Masters of Arts, nor yet the native precocity and mercurial versatility of the youthful Tradesman.
The spirits of men and women who sup are mercurial things, and it was a gay leave-taking half an hour or so later in the little Moorish room at the head of the staircase.