unutterable sin ( synonym found)
Definition of unutterable sin:

(adj) : not utterable; incapable of being spoken or voiced; inexpressible; ineffable; unspeakable; as, unutterable anguish
"sighed and looked unutterable things. - Thomson"
Definition of unutterable sin:

(adj) : not utterable; incapable of being spoken or voiced; inexpressible; ineffable; unspeakable; as, unutterable anguish
"sighed and looked unutterable things. - Thomson"
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