ineffable

in-ef-fa-ble/ɪnˈɛfəbəl/US

adjective

1
Too great or intense to put into words.
She described the view as ineffable and then stopped trying.

From Latin ineffabilis, "unutterable", from in- ("not") and effari ("to speak out").

Also useful for “ineffable”:Unscrambler— Rearrange the letters in “ineffable”