In the most mercurial way, I was assuring him that I would match his fire with fire.
"Father Gary" didn't grow up with a mercurial mortician who embalmed his mother, either.
Like the mercurial McCain, Romney has run an erratic campaign, filled with unforced errors by the candidate himself.
He was a capricious and mercurial student, hugely talented but hugely undisciplined.
His mercurial performance resonates long after the screen goes dark.
When this prescription had produced a little ptyalism the mercurial was omitted and the squill and digitalis continued.
The champagne was bubbling trickily in the veins of the mercurial statesmen.
In making such vessels a mercurial vacuum has been found very satisfactory.
He was not a mercurial man, who easily changed his point of view.
The mercurial steam-gauge, already described, was also used as an additional security.
late 14c., "pertaining to the planet Mercury" (see Mercury). Meaning "sprightly, volatile, quick" (1590s) is from supposed qualities of those born under the planet Mercury (they also are the qualities of the god Mercury), probably also partly by association with the qualities of quicksilver. A variant in this sense was mercurious (1590s). Related: Mercurially; mercuriality.
mercurial mer·cu·ri·al (mər-kyur'ē-əl)
Containing or caused by the action of the element mercury. n.
A pharmacological or chemical preparation containing mercury.