Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
case-hardened is an adjective meaning "used of persons; emotionally hardened". It carries one recorded sense.
used of persons; emotionally hardened
“faced a case-hardened judge”
Definitions, synonyms and semantic relations for case-hardened come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.