Someone who can get mad in the blink of an eye is an example of someone who would be described asmercurial.
- [M-] of Mercury (the god or planet)
- of or containing mercury
- caused by the action or use of mercury
- having qualities attributed to the god Mercury or supposedly influenced by the planet Mercury; eloquent, clever, shrewd, thievish, etc.
- having qualities suggestive of mercury; quick, quick-witted, volatile, changeable, fickle, etc.
Origin of mercurialMiddle English from Classical Latin mercurialis
- often Mercurial a. Roman Mythology Of or relating to the god Mercury.b. Astronomy Of or relating to the planet Mercury.
- Having the characteristics of eloquence, shrewdness, swiftness, and thievishness attributed to the god Mercury.
- Containing or caused by the action of the element mercury.
- Quick and changeable in temperament; volatile: a mercurial nature.
Origin of mercurialMiddle English of the planet Mercury from Latin mercuriālis of the god or planet Mercury from Mercurius Mercury
(comparative more mercurial, superlative most mercurial)
- (often capitalized, see Mercurial) Pertaining to the planet Mercury. [from 14th c.]
- (often capitalized, see Mercurial) Pertaining to the Roman god Mercury. [from 15th c.]
- (astrology) Born under the influence of the planet Mercury, and having such characteristics. [from 16th c.]
- Of, or pertaining to the element mercury; containing mercury; caused by the action of mercury or quicksilver. [from 16th c.]
- Having a volatile or lively character; quick-witted, changeable, animated. [from 17th c.]
- Of or relating to Mercury as the god of trade; hence, money-making; crafty.