— mercurially , adv. — mercurialness, mercuriality , n.
/meuhr kyoor"ee euhl/ , adj.
1. changeable; volatile; fickle; flighty; erratic: a mercurial nature.
2. animated; lively; sprightly; quick-witted.
3. pertaining to, containing, or caused by the metal mercury.
4. ( cap. ) of or pertaining to the god Mercury.
5. ( cap. ) of or pertaining to the planet Mercury.
n.
6. Pharm. a preparation of mercury used as a drug.
[ 1350-1400; ME mercurialis of, pertaining to the god or planet Mercury. See MERCURY, -AL 1 ]
Syn. 1. inconstant, indecisive. 2. spirited.
Ant. 1. constant, steady. 2. phlegmatic.