case-hardened
огрубевший
gehärtet, verhärtet, abgehärtet
Of metal: harder at its surface, due to a case hardening processOf metal: harder at its surface, due to a case hardening process.
Meaning
2 sensesOf metal: harder at its surface, due to a case hardening process.
(broadly, figuratively)Hardened by experience.
used of persons; emotionally hardened