Adjectives

(a)tempered, treated, hardened, toughenedmade hard or flexible or resilient especially by heat treatment“a sword of tempered steel”, “tempered glass”
(a)hardenedprotected against attack (especially by nuclear weapons)“hardened missile silos”
(s)case-hardened, hardened, hard-boiledused of persons; emotionally hardened“faced a case-hardened judge”
(s)enured, inured, hardenedmade tough by habitual exposure“hardened fishermen”, “a peasant, dark, lean-faced, wind-inured” (Robert Lynd), “our successors...may be graver, more inured and equable men” (V.S.Pritchett)
(s)hardened, setconverted to solid form (as concrete)