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