Extended Strong's Greek Lexicon (Abbott-Smith based)
to become callous
Usage: 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)