尽管老师耐心解释，这个固执的学生还是拒绝接受正确答案。

Despite the teacher's patient explanation, the ___stiff-necked student still refused to accept the correct answer.

他那高傲的态度让同事们都不愿与他合作。

His ___stiff-necked attitude made his coworkers reluctant to collaborate with him.