1. Despite all our efforts, he remained unpersuadable and refused to change his mind.

尽管我们尽了一切努力，他仍然不可说服，拒绝改变主意。

2. She is known for her strong opinions and is often regarded as unpersuadable by others.

她以坚定的观点而闻名，常常被人视为固执而不易被说服的。