toughen Synonyms

make stronger stiffening stiffened steel season roughen restrengthen reinforce prop ossify numb nerve lapidify stiffen strengthened hardens toughen up tone up tighten up shore up rigidified desensitize acclimatise temper tempering support strengthen invigorate inure intensify caseharden callous calcify buttress brutalize brace boost bolster blood anneal accustom acclimatize coarsen confirm indurate harden hardening hardened fossilize fortify