toughened Synonyms

tough hardened treated tempered thick-skinned temper sturdy strong strengthen strengthened stiffen stiffened stiff steeled make more severe toughening make stricter shatterproof nonbreaking galvanised hard-boiled case-hardened calloused bulletproof reinforced tighten up armoured solidified solid set fortify fortified firm experient experienced dura callous braced bombproof armored annealed hard harden hardy seasoned rugged roughened resistant reinforce obdurate