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.
Of a person: full of life and vigour, especially with a light and springy step.
Animated, gay, or vivacious; lively, spirited.
Especially of an older person: energetic and in good health; spry.
In a lively and vigorous way; sprightlily.