σκληρύνωsklērýnō

to indurate, i.e. (figuratively) render stubborn

Greek (New Testament) · G4645

Meanings

to harden. Metaph., to harden, make stubborn: with accusative of person, Romans 9:18; τ. καρδίας (Psalms 95:8), Hebrews 3:8, Hebrews 3:15, Hebrews 4:7. Pass., to become hardened: Acts 19:9, Hebrews 3:13.

Same root

Where it appears

Appears 6 times in the Bible.

  • Acts 19:9 But some became stubborn, rejecting his message and publicly speaking against the Way. So Paul left the synagogue and took the believers with him. Then he held daily discussions at the lecture hall of Tyrannus.
  • Romans 9:18 So you see, God chooses to show mercy to some, and he chooses to harden the hearts of others so they refuse to listen.
  • Hebrews 3:8 don’t harden your hearts as Israel did when they rebelled, when they tested me in the wilderness.
  • Hebrews 3:13 You must warn each other every day, while it is still “today,” so that none of you will be deceived by sin and hardened against God.
  • Hebrews 3:15 Remember what it says: “Today when you hear his voice, don’t harden your hearts as Israel did when they rebelled.”
  • Hebrews 4:7 So God set another time for entering his rest, and that time is today. God announced this through David much later in the words already quoted: “Today when you hear his voice, don’t harden your hearts.”

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.