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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
serious-mindedness is a noun meaning "the trait of being serious". It carries one recorded sense.
the trait of being serious
“a lack of solemnity is not necessarily a lack of seriousness”
Definitions, synonyms and semantic relations for serious-mindedness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.