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unutterable adjective

  /(ˌ)ʌnˈʌt(ə)ɹəbl̩/ , /(ˌ)ʌnˈʌtɹəbl̩/ , /ˌʌnˈʌtɚəb(ə)l/ , [ˌʌnˈʌɾɚ.ɪ̈bl̩]
  • Not utterable; incapable of being physically spoken or voiced; unpronounceable.
impronunciabile
  • Incapable of being articulated or expressed; indescribable, inexpressible.
improferibile, impronunciabile, indicibile, inenarrabile, infando
  • (figuratively) Extremely bad or objectionable; unspeakable.
nefando
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