Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unutterable is an adjective meaning "too sacred to be uttered". It carries 3 recorded senses.
too sacred to be uttered
“the ineffable name of the Deity”
defying expression or description
“indefinable yearnings”
“indescribable beauty”
“ineffable ecstasy”
“inexpressible anguish”
“unspeakable happiness”
“unutterable contempt”
“a thing of untellable splendor”
very difficult to pronounce correctly
“an unpronounceable foreign word”
“unutterable consonant clusters”
Definitions, synonyms and semantic relations for unutterable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.