(intransitive) To become hard (tough, resistant to pressure). / (transitive, ergative) To make something hard or harder (tough, resistant to pressure). / (transitive, figuratively) To strengthen.

Alternative form of hurden (“coarse linen”)

The quality or degree of being hardenable.

plural of hardenability

Capable of being hardened.

plural of hardening

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

plural of hardener

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.