An impromptu action is one that you do without planning or organizing it in advance.
例句
This afternoon the Palestinians held an impromptu press conference...今天下午巴勒斯坦方面临时召开了记者招待会。The children put on an impromptu concert for the visitors.孩子们为来访者即兴献上了一场音乐会。
英汉词典释义
adj.
事先无准备(的), 临时(的)
impromptu remarks即席的评论The announcement was made in an impromptu press conference at the airport.这一宣布是在机场举行的临时新闻发布会上作出的。I’m sure his remarks were rehearsed, not impromptu.我肯定他的话是预先想好的, 不是即席讲的。I quite by chance got drawn into a kind of impromptu party downstairs.我碰巧被拉去参加楼下那种临时组织起来的舞会。
英英词典释义
Noun
1. an extemporaneous speech or remark;
"a witty impromptu must not sound premeditated"
2. a short musical passage that seems to have been made spontaneously without advance preparation
Adjective
1. with little or no preparation or forethought;
"his ad-lib comments showed poor judgment""an extemporaneous piano recital""an extemporary lecture""an extempore skit""an impromptu speech""offhand excuses""trying to sound offhanded and reassuring""an off-the-cuff toast""a few unrehearsed comments"