Strong G4190 πονηρός ponēros · evil/bad

Hebrews

1. Hebrews 3:12
   Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
2. Hebrews 10:22
   Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.