σκληρύνω

A. harden, opp. μαλάσσω, Hp. Acut. 45, Arist. HA 548b23:—Pass., with pf. ἐσκλήρυσμαι Hp. Liqu. 6, and ‐υμμαι, to be hardened, grow hard, Id. VM 22, Thphr. Lap. 11.

2. metaph., ς. τὴν καρδίαν τινός harden his heart, LXX Ex. 7.3,al., Ep.Hebr. 3.8,cf.Ep.Rom. 9.18:—Pass., LXX Si. 30.12.