Means, 1. Incapable of being expressed; indescribable or unutterable. See Synonyms; unspeakable. 2. Not to be uttered; taboo: "the ineffable name of God". (American Heritage Dictionary).."..Moreover it is these who have known him who is, the Father, that is, the Root of the All, the Ineffable One who dwells in the Monad. He dwells alone in silence, and silence is tranquillity since, after all, he was a Monad and no one was before him". ("A Valentinian Exposition".)