What is the meaning of 'acrimony'?

The term 'acrimony' refers to a state of bitterness or harshness in feelings or attitudes, particularly in interpersonal relationships. When someone experiences acrimony, it often manifests as sharp or bitter hostility, perhaps during conflicts or disagreements. This aligns perfectly with the concept of being ill-natured, as it involves negative emotions that can lead to conflicts and a lack of civility. The other choices describe concepts that are either oppositional or do not capture the essence of bitterness and hostility inherent in acrimony. Therefore, the selection of ill-natured, bitter hostility as the definition clearly reflects the true meaning of the word.