G4645
σκληρύνω
to harden
σκληρύνω (σκληρός), [in LXX chiefly for קָשָׁה hi., also for חָזַק ;] to harden. Metaphorical, to harden, make stubborn: with accusative of person(s), Rom.9:18; T. καρδίας (Psa.95:8), Heb.3:8, 15 4:7. Pass., to become hardened: Act.19:9, Heb.3:13.† (AS)
The KJV translates G4645 in the following manner:
harden (4x), hardened (4x), Harden (2x), hardeneth (2x)
Full Thayer's lexicon entry
σκληρύνω — sklērýnō
σκληρύνω (cf. Winer's Grammar, 92 (88)); 1 aorist subjunctive 2 person plural σκληρύνητε; passive, imperfect ἐσκληρυνομην; 1 aorist ἐσκληρυνθην; (σκληρός, which see); the Sept. for הִקְשָׁה and הִזֵּק, to make hard, to harden; properly, in Hippocrates and Galen; metaphorically, to render obstinate, stubborn (A. V. to harden): τινα, Rom 9:18 (in opposed to those who interpret it to treat harshly, cf. Fritzsche, vol. ii., p. 323f; (cf., too, Meyer at the passage)); τήν καρδίαν τίνος, Heb 3:8; Heb 3:15 and Heb 4:7 (from Psa 94:8; cf. Exo 7:3; Exo 7:22; Exo 8:19; Exo 9:12); passive (the Sept. for קָשָׁה and חָזַק) to be hardened, i. e. become obstinate or stubborn: Act 19:9; Heb 3:13.
6 occurrences
Acts (1), Romans (1), Hebrews (4)