Noah Webster's Dictionary (a.) Ineffable; unspeakable; indescribable; unutterable; as, inexpressible grief or pleasure.

Multi-Version Concordance Inexpressible (3 Occurrences) 2 Corinthians 9:15 Now thanks be to God for his unspeakable gift! (See RSV) 2 Corinthians 12:4 how he was caught up into Paradise, and heard unspeakable words, which it is not lawful for a man to utter. (See NAS NIV) 1 Peter 1:8 whom not having known you love; in whom, though now you don't see him, yet believing, you rejoice greatly with joy unspeakable and full of glory- (See NAS NIV)