part of speech: adjective

Active; fickle; light- hearted; as, mercurial youth; pertaining to, made of, or caused by, mercury, or quicksilver.

part of speech: adjective

Having the qualities said to belong to the god Mercury: active: sprightly: containing or consisting of mercury.

Sprightly; vivacious; containing mercury.

part of speech: adjective

Pertaining to consisting of, or due to quicksilver; like the god Mercury; active; flighty; fickle; changeable; pertaining to trade or trading.

part of speech: adjective

Active; sprightly; versatile; consisting of or containing mercury or quicksilver.

Jerry's mercurial spirits were mounting now. "Country Neighbors", Alice Brown.

For while for her father she cherished an affectionate pride and for her mother an amused and protective pity, her great passion was for her brother- her handsome, vivacious, audacious and mercurial brother, Tony. "To Him That Hath A Novel Of The West Of Today", Ralph Connor.

Kenneth, it must be confessed, was less impatient than Pariset, whose mercurial temperament ill- brooked a waiting game. "A Hero of Liége", Herbert Strang.

These included paralysis by mercury of refiners of silver and gold, paralysis by mercurial fumes of molten lead by plumbers, palsy of glaziers working with melted lead and of watch gilders, lead poisoning of painters, blinding by sawdust of sawyers, and the affects of fumes on pewterers and letter founders. "Our Legal Heritage, 4th Ed.", S. A. Reilly.