G0524
ἀπαλγέω
to become callous
ἀπ-αλγέω, -ῶ __1. prop., to cease to feel pain for (Thuc., ii, 61). __2. In late Gk. __(a) to despair (Polyb., i, 35, 5); __(b) to become callous, reckless (Polyb., xvi, 12, 7; MM, VGT, see word): Eph.4:19.† (AS)
Full Thayer's lexicon entry
ἀπαλγέω — apalgéō
ἀπαλγέω, ἀπάλγω: (perfect participle ἀπηλγηκως); to cease to feel pain or grief;
a. to bear troubles, with greater equanimity, cease to feel pain at: Thucydides 2, 61 etc.
b. to become callous, insensible to pain, apathetic: so those who have become insensible to truth and honor and shame are called ἀπηλγηκότες (A. V. past feeling) in Eph 4:19. (Polybius 1, 35, 5 ἀπηλγηκυιας ψυχάς dispirited and useless for war (cf. Polybius 16, 12, 7).)
1 occurrence