Unspeakable

denotes "inexpressible" (a, negative, n, euphonic, ekdiegeomai, "to declare, relate"), 2Co 9:15, "unspeakable" (of the gift of God); regarding the various explanations of the gift, it seems most suitable to view it as the gift of His Son.

denotes "unable to be told out" (eklaleo, "to speak out"), 1Pe 1:8, of the believer's joy.

primarily, "unspoken" (a, negative, rhetos, "spoken"), denotes "unspeakable," 2Co 12:4, of the words heard by Paul when caught up into paradise. The word is common in sacred inscriptions especially in connection with the Greek Mysteries; hence Moulton and Milligan suggest the meaning "words too sacred to be uttered."