v. 25B6; verb
this glue will harden in four hours : SOLIDIFY, set, congeal, clot, coagulate, stiffen, thicken, cake, inspissate; freeze, crystallize; ossify, petrify.
their suffering had hardened them : TOUGHEN, desensitize, inure, case-harden, harden someone's heart; deaden, numb, benumb, anaesthetize; brutalize.
liquefy, soften.