As tough, hard, or inflexible as a piece of rock.
With strongly held beliefs and opinions, deep conviction.
With muscles developed and toned to a high degree, especially the muscles of the abdomen.
Having a very fully erect and stiff penis
As hard as stone.
Of an action or expression such as a look, showing no warmth of emotion.
Containing or made up of stones.
Of a person, lacking warmth and emotion.