protracted

1. ADJ Something, usually something unpleasant, that is protracted lasts a long time, especially longer than usual or longer than you hoped. 拖拉的[正式]

However, after protracted negotiations Ogden got the deal he wanted. 然而，经过拖拉的谈判，奥格登还是得到了他想要的那笔交易。

...a protracted civil war. …一场旷日持久的内战。