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.
Easily rocked; unstable.
Encountering many problems; difficult, troubled; also, in danger or distress.
Of a person: ill, or unsteady (for example, as a result of a shock).
Simple, not complicated, basic.