Strong's Concordance

Original word: ἀνεκλάλητος
Transliteration: aneklalétos
Definition (short): inexpressible
Definition (full): unspeakable

NAS Exhaustive Concordance

Word Origin: from alpha (as a neg. prefix) and eklaleó
Definition: unspeakable
NASB Translation: inexpressible (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a (as a negative particle) and a presumed derivative of eklaleo; not spoken out, i.e. (by implication) unutterable -- unspeakable.

see GREEK a

see GREEK eklaleo

KJV: Whom having not seen, ye love; in whom, though now ye see him not, yet believing, ye rejoice with joy unspeakable and full of glory:
NASB: and though you have not seen Him, you love Him, and though you do not see Him now, but believe in Him, you greatly rejoice with joy inexpressible and full of glory,