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.
Easily rocked; unstable.
In the style of rock music.
Abounding in, or full of, rocks; consisting of rocks.
Like a rock; rigid, solid.
Having a habitat around or on rocks.
Encountering many problems; difficult, troubled; also, in danger or distress.
Of a person: ill, or unsteady (for example, as a result of a shock).