Kinetically unstable; rapidly cleaved (and possibly reformed).
Liable to slip, err, fall, or apostatize.
Able to change valency without changing its form; especially, able to be used both transitively and intransitively without changing its form.
Apt or likely to change.
Unpredictable, erratic or fickle; mercurial.
The metal mercury.
An amalgam of mercury and tin applied to the backs of mirrors, quicksilvering.
To overlay with quicksilver.
To treat with quicksilver.