Mercurial [Noun.]

1. Volatile; erratic; unstable; flighty; fickle or changeable in temperament.
2. Lively; clever; sprightly; animated; quick-witted. ‘I have a mercurial wit.’
3. Having characteristics attributed to the Shakespeare character Mercutio, such as volatile, erratic, unstable, and shrewdness.
4. Of, or pertaining to the element mercury; containing mercury; caused by the action of mercury or quicksilver.
5. Having characteristics attributed to the Roman god Mercury, such as swiftness, eloquence, shrewdness, and thievishness.
6. In Roman mythology, of or pertaining to the Roman god Mercury.
7. In astronomy, of or pertaining to the planet Mercury; under the supposed astrological influence of the planet Mercury.

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