Adjectives

(s)case-hardened, hardened, hard-boiledused of persons; emotionally hardened“faced a case-hardened judge”
(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)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)