Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
obscureness is a noun meaning "the state of being humble and unimportant". It carries 3 recorded senses.
the state of being humble and unimportant
the state of being indistinct or indefinite for lack of adequate illumination
the quality of being unclear or abstruse and hard to understand
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 obscureness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.