"Inutterable" is a word in ENGLISH

Not capable of expression or utterance in language; ineffable; unspeakable; indescribable; unutterable; as, inexpressible grief or pleasure.

In an inexpressible manner or degree; unspeakably; unutterably.

sábi - (From the Sp. saber) To know, understand, comprehend; to explain, describe. Mostly used in the negative forms "índì …

Incapable of being expressed; inexpressible; unutterable; ineffable.

Not speakable; incapable of being uttered or adequately described; inexpressible; unutterable; ineffable; as, unspeakable grief or rage.

Not utterable; incapable of being spoken or voiced; inexpressible; ineffable; unspeakable; as, unutterable anguish.