Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
old-fashionedness is a noun meaning "the property of being no longer fashionable". It carries one recorded sense.
the property of being no longer fashionable
Definitions, synonyms and semantic relations for old-fashionedness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .