1. the process of becoming or making something become solid or stiff
   • ● hardening of the arteries
2. the process of becoming less kind or more fixed and determined
   • ● a hardening of attitudes towards one-parent families
   • ● Sandra answered with a sudden hardening of her tone.
   • ● The sufferings of 1914-1918 led to a hardening of hearts.

[TahlilGaran] English Dictionary ▲