ineffable

(Latin: in, not; effari, to express)

Inexpressible, used: (1) of God, meaning that His perfections are so great that it is impossible to express them in words;

(2) of His Name, Jehovah (Yahveh, Yahweh), which, among the Jews in the Old Testament was held in such veneration that only priests were permitted to pronounce it in the sanctuary and even then in a low tone, the people using the substitute Adonai, Lord, Ruler.

New Catholic Dictionary

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