Rancorousness refers to feelings or behavior that are filled with bitterness, resentment or a deep-seated hatred. Synonyms for this word include animosity, spitefulness, malice, vengefulness, acrimony, hatred, grudge, and malevolence. When one is experiencing rancorousness, they may find it difficult to forgive and forget the wrongs done to them, leading to a lifelong grudge. In extreme situations, rancorousness can lead to violence, revenge, and even death. It is important to address these negative emotions carefully to prevent further harm. Practicing forgiveness, empathy, and understanding can aid in the healing process for both the individual and others involved.