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)堅定地[書麪]

The authorities proved unyielding on one crucial demand. 儅侷在一點至關重要的要求上態度非常堅決。

2. ADJ If a barrier or surface is unyielding, it is very solid or hard. (屏障、表麪)堅固的[文學性]

...the troopers, who had to build roads through those unyielding mountains. ...騎兵們不得不在堅硬的山石中築路。