Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
good-temperedness is a noun meaning "a cheerful willingness to be obliging". It carries one recorded sense.
a cheerful willingness to be obliging
Definitions, synonyms and semantic relations for good-temperedness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.