obdurate

无论我们怎么劝说，她依然固执地坚持自己的决定。

No matter how we tried to persuade her, she remained ___obdurate in her decision.

那位顽固的经理拒绝批准任何加班费，即使是在最繁忙的季度也不为所动。

The ___obdurate manager refused to approve any overtime pay, even during the busiest quarter.

那个固执的守卫没有正式的表格就不让送货员进门。

The ___obdurate gatekeeper would not let the delivery person enter without the proper form.