人嘴硬爱逞强固执不愿回头
[rén zuĭ yìng ài chĕng qiáng gù zhí bù yuàn huí tóu]
Means 'A stubborn person, unwilling to change, insists on being tough.' This portrays someone who does not want to admit mistakes or weakness, insisting on their own way even if it is wrong.