hard-boiled

(s) tough and callous by virtue of experience hard-bitten, pugnacious,
(s) used of persons; emotionally hardened
- faced a case-hardened judge
case-hardened, hardened,
(s) (eggs) cooked until the yolk is solid

Synonyms

hard-bitten pugnacious case-hardened hardened

Words of close approximity

hard-boiled egg