What does "revengeful" mean?

Revengeful: Full of, or prone to, revenge; vindictive; malicious; revenging; wreaking revenge. If thy revengeful heart can not forgive. Shak. May my hands . . . Never brandish more rebvengeful steel. Shak. -- Re*venge"ful*ly, adv. -- Re*venge"ful*ness, n.

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