Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
tough-skinned is an adjective meaning "having a relatively tough outer covering". It carries 2 recorded senses.
having a relatively tough outer covering
insensitive to criticism
Definitions, synonyms and semantic relations for tough-skinned come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.