Rancour/ˈræŋkər/ Definition 1 of 2Pro Tip 1/3Deep Hurt Rancour often implies deep emotional pain that's held onto for a long time. He harbored rancour after the betrayal, struggling to forgive. Pro Tip 2/3Not Quick Anger Rancour is not a brief or passing annoyance but a lasting bitterness. Despite the apology, rancour lingered in her heart. Pro Tip 3/3Internal Feeling Rancour is felt internally and may not always be shown openly. He masked his rancour with a polite smile.