In an unutterable manner; inexpressibly.

Not utterable; incapable of being physically spoken or voiced; unpronounceable. / Incapable of being articulated or expressed; indescribable, inexpressible.

Something which is unutterable (incapable of being physically spoken, incapable of being articulated or expressed, etc.).

The state or condition of being unutterable.

unutterableness / Something that cannot be said.

plural of unutterability

(slang) Trousers.

plural of unutterable