Tact and subtle skill in dealing with people so as to avoid or settle hostility.
The art and practice of conducting international relations by negotiating alliances, treaties, agreements etc., bilaterally or multilaterally, between states and sometimes international organizations, or even between polities with varying status, such as those of monarchs and their princely vassals.
A feeling of long-lasting ire for another, sometimes to the point of hatred, over a perceived wrongdoing; bitterness.
Rancidity, rankness.