随便的短语可以用 "off the cuff" 表示。这个短语的来源是在演讲或演出中，演讲者或表演者没有准备讲稿或脚本，而是即兴发挥的意思。
例句：
He made some off the cuff comments during the meeting that caused some embarrassment. (他在会议上随口说了几句话，引起了尴尬。)
She gave an off the cuff performance that impressed everyone in the audience. (她即兴表演，给观众留下了深刻印象。)