unyielding

1. ADJ You describe someone as unyielding when they have very strong, fixed ideas about something and are unlikely to change their mind. (人)坚定地[书面]

The authorities proved unyielding on one crucial demand. 当局在一点至关重要的要求上态度非常坚决。

2. ADJ If a barrier or surface is unyielding, it is very solid or hard. (屏障、表面)坚固的[文学性]

...the troopers, who had to build roads through those unyielding mountains. ...骑兵们不得不在坚硬的山石中筑路。