listless
adjective uk/ˈlɪst.ləs/ us/ˈlɪst.ləs/
懈怠的，懒散的，无精打采的
having no energy and enthusiasm and unwilling to do anything needing effort
He's seemed listless and a little depressed ever since he got his exam results. 自从得知自己的考试分数后他就一直无精打采，心情也有些低落。