noncommittal
adjective uk/ˌnɒn.kəˈmɪt.əl/ us/ˌnɑːn.kəˈmɪt̬.əl/
不表态的；含糊的
not expressing an opinion or decision
The ambassador was typically noncommittal when asked whether further sanctions would be introduced. 当被问及是否会进一步实施制裁时，大使一如既往地含糊其词。