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1. often Mercurial
a. Roman Mythology Of or relating to the god Mercury.
b. Astronomy Of or relating to the planet Mercury.
2. Having the characteristics of eloquence, shrewdness, swiftness, and thievishness attributed to the god Mercury.
3. Containing or caused by the action of the element mercury.
4. Quick and changeable in temperament; volatile: a mercurial nature.
A pharmacological or chemical preparation containing mercury.

[Middle English, of the planet Mercury, from Latin mercuriālis, of the god or planet Mercury, from Mercurius, Mercury.]

mer·cu′ri·al·ly adv.
References in periodicals archive ?
Among these the ones considered critical are: Gross lack of resources to deal with a daunting and mercurially dynamic situation, weak management of human and financial resources and serious trust deficit between public and police.
Here they played with the kind of reckless abandon that is worthy of a side this mercurially talented.
Our lessons mimicked the huge range of delights on Robin's wall, with discussions flitting mercurially between music, art, philosophy, history, poetry, and back to music again.
For instance, Husain has produced from the ordinary to the mercurially brilliant.
On the other hand, Morgan frequently ignores his own directive and seeks to ascertain the precise significance of a given shot, cut, or formal device, only to be invariably thwarted by the mercurially polysemic nature of Godard's work.