at loose ends 无所事事;百无聊赖;不知做什么好

【例句】
Many old people feel at loose ends after their retirement.
许多老年人退休以后都感觉无所事事。

Peter spent more than two years wandering about the country at loose ends.
两年多的时间，彼得在国内东游西荡，无所事事。