unyielding
adjective uk/ʌnˈjiːl.dɪŋ/ us/ʌnˈjiːl.dɪŋ/
(NOT CHANGING)
坚定的；不屈服的；固执的
completely unwilling to change a decision, opinion, demand, etc.
Korea is unyielding in its demands for a new treaty. 朝鲜坚决要求签订新的条约。
(NOT BENDING)
坚挺的，不易弯曲的
rigid (= not able to be bent or moved)