Given to sudden or frequent changes of mind; temperamental.
Dour, gloomy or brooding.
Of dubious origin; counterfeit or stolen.
Sulky or depressed.
Unpredictable, erratic or fickle; mercurial.
To overlay with quicksilver.
To treat with quicksilver.
The metal mercury.
An amalgam of mercury and tin applied to the backs of mirrors, quicksilvering.