ineffable - vocabulary

  edgood  —  Grammar Tips

Incapable of being expressed or described in words, as in ineffable joy; not to be spoken because of its sacredness, unutterable, as in the ineffable name of the deity.
He began with being a young man of promise; at Oxford he distinguished himself, to his father’s ineffable satisfaction, and the people about him said it was a thousand pities so clever a fellow should be shut out from a career.

—Henry James The Portrait of a Lady (1908)