mercurial

IPA: mɝkjˈʊriʌɫ

(obsolete) Any of the plants known as mercury, especially the annual mercury or French mercury (Mercurialis annua).
(astrology) A person born under the influence of the planet Mercury; hence, a person having an animated, lively, quick-witted or volatile character.
(chemistry) A chemical compound containing mercury.
(pharmacology, historical) A preparation of mercury, especially as a treatment for syphilis.

(comparable) Having a lively or volatile character; animated, changeable, quick-witted.
(not comparable, astrology) Pertaining to the astrological influence of the planet Mercury; having the characteristics of a person under such influence (see adjective sense 1).
(not comparable, astronomy) Pertaining to the planet Mercury.
(not comparable, chemistry) Of or pertaining to the element mercury or quicksilver; containing mercury.
(not comparable, medicine) Caused by the action of mercury or a mercury compound.
(not comparable, Roman mythology) Pertaining to Mercury, the Roman god of, among other things, commerce, financial gain, communication, and thieves and trickery; hence (comparable), money-making; crafty.
Alternative letter-case form of mercurial. [(comparable) Having a lively or volatile character; animated, changeable, quick-witted.]

Examples of "mercurial" in Sentences

Her mood was as mercurial as the weather, changing from sunny to stormy in an instant
The mercurial artist was known for producing wildly different works of art, from abstract paintings to realistic sculptures
His reputation in the office was mercurial, with some coworkers praising his innovative ideas while others criticized his unpredictable behavior
The coach struggled to understand the mercurial nature of his star player, who could be brilliant one game and disappear the next
The stock market was notoriously mercurial, with prices fluctuating wildly throughout the day