noun
thankless role; ungracious part
Refers to a role or task that is necessary but brings dislike or criticism, such as the 'bad guy' in a group or the person who must enforce unpopular rules.
彼はいつも憎まれ役を引き受ける。
He always takes on the thankless role.
会議で反対意見を言うのは憎
Voicing opposing opinions in meetings is a thankless task.