3. Appease, conciliate, propitiate imply trying to preserve or obtain peace. To appease is to make anxious overtures and often undue concessions to satisfy the demands of someone with a greed for power, territory, etc.: Chamberlain tried to appease Hitler at Munich. To conciliate is to win an enemy or opponent over by displaying a willingness to be just and fair: When mutual grievances are recognized, conciliation is possible. To propitiate is to admit a fault, and, by trying to make amends, to allay hostile feeling: to propitiate an offended neighbor.

Did you mean inappeasable?