toughen Synonyms

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