Lexical Definition

‎κατάνυξις‎ katányxis (kat-an'-oox-is) stupor ^G:N-F
from ‎κατανύσσω‎

slumber.

• a prickling (sensation, as of the limbs asleep), i.e. (by implication, (perhaps by some confusion with ‎νεύω‎ or even with ‎νύξ‎)) stupor (lethargy)

Abbott-Smith

† κατά-νυξις, -εως, ἡ (< κατανύσσω, q.v.), [in LXX: Ps 59 (60):3* (תַּרְעֵלָה), Is 29:10 (תַּרְדֵּמָה)*;]
1. a pricking.
2. (Perhaps through resembl. of κατανύσσω to -νυστάζω), torpor of mind, stupefaction: Ro 11:8(LXX) (v. ICC, in l.; Field, Notes, 157).†

Abbott-Smith References

Liddell-Scott-Jones

κατάνυξις-νυξις, εως, ἡ,

stupefaction, bewilderment, [LXX]

__2 contrition, [Refs 6th c.AD+]

_{LSJ Scripture Refs: LXX.Isa.29.10}