σκληρύνω

Derivation

from G4642 (σκληρός);

Meaning

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

In the King James Version

harden

Translated as

harden (3), hardened (2)

Where it appears

Found in 5 verses

Acts

19:9

Hebrews

3:8, 3:13, 3:15, 4:7