If you describe someone as self-serving, you are critical of them because they are only interested in what they can get for themselves.
例句
They suggest that my motives for proposing reform are self-serving and mercenary.他們暗示說我之所以提議改革是貪圖金錢，想謀取私利。...corrupt, self-serving politicians.貪污腐敗、一心謀私利的政治家們