Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
mild-mannered is an adjective meaning "behaving in or having a mild or gentle manner". It carries one recorded sense.
behaving in or having a mild or gentle manner
Definitions, synonyms and semantic relations for mild-mannered come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.