σκληρύνω
(< σκληρός), [in LXX chiefly for קשׁה hi., also for חזק;]
to harden. Metaph., to harden, make stubborn: c. acc. pers., Ro 9:18; τ. καρδίας (Ps 94 (95):8), He 3:8, 154:7. Pass., to become hardened: Ac 19:9, He 3:13.†
G. Abbott-Smith's A Manual Greek Lexicon of the New Testament
σκληρύνω
(< σκληρός), [in LXX chiefly for קשׁה hi., also for חזק;]
to harden. Metaph., to harden, make stubborn: c. acc. pers., Ro 9:18; τ. καρδίας (Ps 94 (95):8), He 3:8, 154:7. Pass., to become hardened: Ac 19:9, He 3:13.†