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Synonyms
un·ut·ter·a·ble (ŭn-ŭt́ər-ə-bəl)

adjective 

  1. That cannot or must not be uttered or expressed: “I burned in the unutterable beauty of being alive” (John Peale Bishop) See synonyms at unspeakable
  2. Being such that pronunciation is impossible: unutterable consonant clusters.

derivatives

un·ut́ter·a·ble·ness
noun
un·ut́ter·a·bly
adverb