Malevolence has a very strong negative feeling; it's much more intense than disliking someone. The villain's malevolence towards the hero could be felt by everyone.
Pro Tip 2/3
Intent to Hurt
Malevolence is not just thinking bad thoughts; it includes wanting to cause physical or emotional pain. Her malevolence drove her to sabotage her coworker's project.
Pro Tip 3/3
Serious Accusation
Calling someone malevolent is a serious charge. Use it carefully to avoid offending without reason. Accusing my brother of malevolence hurt him deeply because he values kindness.