merculiar

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mercurial
1 of 2
adjective
mer·;cu·;ri·;al (;)m;r-;kyu;r-;-;l
Synonyms of mercurial
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
mercurially
(;)m;r-;kyu;r-;-;-l;
 adverb
mercurialness noun
mercurial

2 of 2
noun
: a pharmaceutical or chemical containing mercury


Did you know?
The Roman god Mercury 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. Mercurial comes from the Latin adjective mercurialis, meaning "of or relating to Mercury."

Synonyms
Adjective

capricious
changeable
changeful
fickle
flickery
fluctuating
fluid
inconsistent
inconstant
mutable
skittish
temperamental
uncertain
unpredictable
unsettled
unstable
unsteady
variable
volatile
Choose the Right Synonym for mercurial

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
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
Recent Examples on the Web
Adjective
In Taiwan, where many supported Trump in 2020 for his tough-on-China stance, some people have since grown wary of the former president’s mercurial approach to foreign policy.
—Laura King, Los Angeles Times, 29 Oct. 2024
As a Virgo herself, Lively brings out the earthy, practical and poised nature of her sign, embodying the quiet charisma and humor of Chaplin with her mercurial precision.
—Valerie Mesa, People.com, 28 Oct. 2024
Noun
Austin Butler is the wild-at-heart troublemaker, Jodie Comer is his worried girlfriend, but Tom Hardy shines as the bikers' mercurial, Brando-esque leader.
—Brian Truitt, USA TODAY, 16 Aug. 2024
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'mercurial.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.


Word History
Etymology
Adjective

see mercury

Noun

see mercury

First Known Use
Adjective

14th century, in the meaning defined at sense 1

Noun

1676, in the meaning defined above

Time Traveler
The first known use of mercurial was in the 14th century
See more words from the same century