σκληρύνω sklērýnō

Greek · Strong's G4645 · used 6 times in 6 verses

Meaning

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

In the King James Version: harden

Derivation: from G4642 (σκληρός);

Acts 19:9 But when some of them stubbornly refused to believe and publicly maligned the Way, Paul took his disciples and left the synagogue to conduct daily discussions in the lecture hall of Tyrannus.
Romans 9:18 Therefore God has mercy on whom He wants to have mercy, and He hardens whom He wants to harden.
Hebrews 3:8 do not harden your hearts, as you did in the rebellion, in the day of testing in the wilderness,
Hebrews 3:13 But exhort one another daily, as long as it is called today, so that none of you may be hardened by sin’s deceitfulness.
Hebrews 3:15 As it has been said: “Today, if you hear His voice, do not harden your hearts, as you did in the rebellion.”
Hebrews 4:7 God again designated a certain day as “Today,” when a long time later He spoke through David as was just stated: “Today, if you hear His voice, do not harden your hearts.”