Firm and unyielding in consistency; not easily broken, bent, or pierced; solid, rigid.

Firm, unyielding, strong, †rigid, stiff (as in death).

Of material things: Hard, stiff, rigid. Obsolete except of wood or stone (with some notion of sense 2).

Of a physical object or substance: hard, resistant, impenetrable. Now rare.

Of substances (or their structure): Not yielding to force or pressure; unpliant, unbending; stiff, hard. Also const. to.

That offers physical resistance to motion, deformation, or pressure.

Not readily liable to impressions; = insusceptible, adj. c.