The ineffable name of God.
An example of ineffable is overwhelming sadness that one does not know how to show.
An example of ineffable is the name of a deity that cannot be said out of respect.
God's ineffable name.
Origin of ineffable
From American Heritage Dictionary of the English Language, 5th Edition
- First attested in 1450. From Middle French ineffable, from Latin ineffābilis, from in- (“not”) + effor (“utter”).