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. 执拗的; 顽固不化的[正式]

Parts of the administration may be changing but others have been obdurate defenders of the status quo. 政府的一些部门可能正在作出改变，但其他部门却要执意维持现状。