impair [ɪmˈpeə(r)] v. 削弱，损害，损伤

例句 They may spend hours lying awake in bed worrying about being unable to sleep, and the anxiety itself impairs their ability to sleep. 【2017-1《纽约

时报》】

他们可能清醒着躺在床上数小时，担心自己睡不着，而这种焦虑本身损害了他们的睡眠能力。