obdurate

1. ADJ If you describe someone as obdurate, you think that they are being unreasonable in their refusal to change their decision or opinion. 執拗的; 頑固不化的[正式]

Parts of the administration may be changing but others have been obdurate defenders of the status quo. 政府的一些部門可能正在作出改變，但其他部門卻要執意維持現狀。