mercurial

adjective
mer·​cu·​ri·​al | \ (ˌ)mər-ˈkyu̇r-ē-əl How to pronounce mercurial (audio) \

Definition of mercurial

 (Entry 1 of 2)

1 : of, relating to, or born under the planet Mercury
2 : having qualities of eloquence, ingenuity, or thievishness attributed to the god Mercury or to the influence of the planet Mercury
3 : characterized by rapid and unpredictable changeableness of mood a mercurial temper
4 : of, relating to, containing, or caused by mercury

mercurial

noun

Definition of mercurial (Entry 2 of 2)

: a pharmaceutical or chemical containing mercury

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Other Words from mercurial

Adjective

mercurially \ (ˌ)mər-​ˈkyu̇r-​ē-​ə-​lē How to pronounce mercurially (audio) \ adverb
mercurialness noun

Choose the Right Synonym for mercurial

Adjective

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

Did You Know?

Adjective

The Roman god Mercury ("Mercurius" in Latin) was the messenger and herald of the gods and also the god of merchants and thieves. (His counterpart in Greek mythology is Hermes.) He was noted for his eloquence, swiftness, and cunning, and the Romans named what appeared to them to be the fastest-moving planet in his honor. The Latin adjective derived from his name, mercurialis, meaning "of or relating to Mercury," was borrowed into English in the 14th century as "mercurial." Although the adjective initially meant "born under the planet Mercury," it came to mean also "having qualities of eloquence, ingenuity, or thievishness attributed to the god Mercury or the influence of the planet Mercury," and then "unpredictably changeable."

Examples of mercurial in a Sentence

Adjective

Few moments in English history have been more hungry for the future, its mercurial possibilities and its hope of richness, than the spring of 1603. — Adam Nicolson, God's Secretaries, 2003 Though you could see all three places in one day, each of them makes you want to stay or to keep returning to watch the effects of the changing weather and the mercurial Sicilian light. — Francine Prose, Atlantic, December 2002 Some scientists suggest that because manic-depressive patients are ever riding the bio-chemical express between emotional extremes, their brains end up more complexly wired and remain more persistently plastic than do the brains of less mercurial sorts. — Natalie Angier, New York Times, 12 Oct. 1993 Still grinning, still miming, he samba-ed across the floor … and started in on the dishes with a vigor that would have prostrated his mercurial cousin. — T. Coraghessan Boyle, Harper's, October 1987 the boss's mood is so mercurial that we never know how he's going to react to anything
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Recent Examples on the Web: Adjective

The injury casts further doubt on the future of the mercurial star, just two seasons removed from the cusp of what almost assuredly would have been a maximum contract before tearing his left Achilles tendon in January 2018 with New Orleans. Jon Schultz, SFChronicle.com, "Lakers’ DeMarcus Cousins reportedly suffers torn ACL in workout," 15 Aug. 2019 The mercurial Bishop was a foster kid and his relationship with girlfriend Sophia (Emma Rigby) is falling apart. Daniel Fienberg, The Hollywood Reporter, "'Bulletproof': TV Review," 6 Aug. 2019 And with a voice as magically mercurial as its plot, The Underground Railroad won a National Book Award, a Pulitzer Prize and, perhaps most important, Oprah Winfrey's blessing. Ron Charles, Dallas News, "In Colson Whitehead's 'The Nickel Boys,' an idealistic black teen learns a harsh reality," 9 July 2019 Which is why all of this social-media nonsense about the Magic possibly acquiring mercurial Oklahoma City point guard Russell Westbrook is nothing but a bunch of Twitter litter. Mike Bianchi, orlandosentinel.com, "Nikola Vucevic is the anti-Dwight Howard — an all-star who realizes how good he has it in Orlando | Commentary," 8 July 2019 Despite the injury history and mercurial reputation, Cousins could probably help the Pistons. Vince Ellis, Detroit Free Press, "Why DeMarcus Cousins is an unlikely option for Detroit Pistons in free agency," 4 July 2019 The book seems to suggest that the real American inheritance is transformation, and that American transformation is a mercurial thing. Constance Grady, Vox, "Reading Amelia Bedelia as a parable on domestic labor," 15 June 2019 Pinballing day in and day out with the mercurial Trump is not the best way to fulfill that latter duty. David Zurawik, baltimoresun.com, "Trump's TV messaging machine not looking quite so mighty these days," 12 July 2018 At one time or another, fat Shawn Kemp, mercurial Nicholas Batum, high school stars-turned-NBA journeymen Sebastian Telfair and Martell Webster and overpaid Evan Turner and Meyers Leonard have all been held in esteem by Portland fans. Andrew Nemec, OregonLive.com, "Dear LeBron James, apology not accepted! Love, Portland: Commentary," 7 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mercurial.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of mercurial

Adjective

14th century, in the meaning defined at sense 1

Noun

1676, in the meaning defined above

History and Etymology for mercurial

Adjective

see mercury

Noun

see mercury

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