Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
interestingness is a noun meaning "the power of attracting or holding one's attention (because it is unusual or exciting etc.)". It carries one recorded sense.
the power of attracting or holding one's attention (because it is unusual or exciting etc.)
“they said nothing of great interest”
“primary colors can add interest to a room”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for interestingness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.