Lexical Definition

‎ἀλάλητος‎ alálētos (al-al'-ay-tos) inexpressible ^G:A
from ‎Α‎ (as a negative particle) and a derivative of ‎λαλέω‎

unutterable, which cannot be uttered.

• unspeakable

Abbott-Smith

† ἀ-λάλητος, -ον (< λαλέω),
inexpressible, not to be uttered: Ro 8:26.†

Abbott-Smith References

Liddell-Scott-Jones

ἀλάλητος [λᾰ], ον,

unspeakable, unutterable, variant in [NT+6th c.BC+]adverb -τως, as explanation of ἀλόγως[Refs]

__II ἀλάλητα· ξύλα ποταμόκλυστα, γομφώδη, [Refs 5th c.AD+]

_{LSJ Scripture Refs: Rom.8.26}