Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unnameable is an adjective meaning "too sacred to be uttered". It carries one recorded sense.
too sacred to be uttered
“the ineffable name of the Deity”
Definitions, synonyms and semantic relations for unnameable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.