What is another word for unutterable sin?
Pronunciation: [ʌnˈʌtəɹəbə͡l sˈɪn] (IPA) 
The term "unutterable sin" refers to an act or behavior that is so heinous, immoral, or unforgivable that it cannot be expressed in words. Synonyms for this concept include "unforgivable offense," "atrocious transgression," "unspeakable crime," "abhorrent wrongdoing," "outrageous misconduct," "unsavory behavior," or even "ultimate blasphemy." Such actions may include murder, rape, genocide, or betrayal, and they are often viewed as morally reprehensible and socially unacceptable. The term "unutterable sin" is commonly used in religious contexts to denote a transgression against divine laws or moral principles, and it reflects a deep sense of shame, guilt, and regret for the offender.
