Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
naturalness is a noun meaning "the quality of being natural or based on natural principles". It carries 3 recorded senses.
the quality of being natural or based on natural principles
“he accepted the naturalness of death”
“the spontaneous naturalness of his manner”
the quality of innocent naivete
the likeness of a representation to the thing represented
“engineers strove to increase the naturalness of recorded music”
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 naturalness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.