simple past tense and past participle of harden

Inured; toughened. / Unfeeling; pitiless; callous. / Firmly established or unlikely to change; inveterate. / (computing, military) Having extra defences against attack; highly fortified.

Capable of being hardened.

plural of hardenability

The quality or degree of being hardenable.

A surname.

plural of Harden

plural of hardening

Alternative form of hurden (“coarse linen”)

One who, or that which, hardens. / A chemical substance added to something in order to harden it; used especially with paints, varnishes and resins.