Vindictiveness is a strong desire to get back at someone. People who hold grudges and seek revenge are full of vindictiveness. If someone steps on your toe, and you put on boots to stomp back, you’re full of vindictiveness.
Use the noun vindictiveness to describe the need for vengeance, or the urge to retaliate against someone who's done you wrong. If you can’t let go of the anger that comes from being mistreated or hurt and you’re plotting revenge, you’re full vindictiveness. At the heart of vindictiveness is the Latin root word vindicta, which means "revenge."