Quick Definition
unutterable, that baffles words
Strong's Definition
unspeakable
Derivation: from G1 (Α) (as a negative particle) and a derivative of G2980 (λαλέω);
KJV Usage: unutterable, which cannot be uttered
Thayer's Greek Lexicon
ἀλάλητος, (λαλητός from λαλέω; (cf. Winers Grammar, 23)), not to be uttered, not to be expressed in words: στεναγμοί mute sighs, the expression of which is suppressed by grief, Rom_8:26 (others, 'which (from their nature) cannot be uttered'; cf. Meyer at the passage; Winers Grammar, 97 (92)). (Anth. Pal. 5, 4 συνίστορα ἀλαλήτων, i. e. of love-secrets.)
Mounce Concise Greek Dictionary
ἀλάλητος alalētos 1x
unutterable, or, unexpressed, Rom_8:26
Abbott-Smith Greek Lexicon
† ἀ -λάλητος , -ον
( < λαλέω ),
inexpressible, not to be uttered: Rom_8:26 .†
Liddell-Scott — Intermediate Greek Lexicon
ἀλάλητος [Etym: λαλέω] "unutterable", Anth. , NTest.
STEPBible — Tyndale Abridged Greek Lexicon
ἀ-λάλητος, -ον
(λαλέω),
inexpressible, not to be uttered: Rom.8:26.†
(AS)