单词：impromptu 

名词

• 
  [1.n.impromptu] (同义词:[impromptu( n. 即席演出, 即兴曲 adj. 即席的 adv. 即席地, 未经准备地 )]  )
• 
  注释列句：an extemporaneous speech or remark; "a witty impromptu must not sound premeditated"
• 上位词 -> [address( n. 地址, 致辞, 演讲, 说话的技巧 vt. 向...致辞, 演说, 写姓名地址, 从事, 忙于 )]  [speech_act]  [act( n. 幕, 法案, 法令, 动作, 举动, 节目, (戏剧的)幕 vi. 行动, 产生...的效果, 担当, 表演, 假装, 表现, 见效 vt. 扮演, 装作 )]  [event( n. 事件, 事变, 结果, 活动, 精力, 竞赛 )]  [psychological_feature(心理特征 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )] 
• 
  [2.n.impromptu] (同义词:[impromptu( n. 即席演出, 即兴曲 adj. 即席的 adv. 即席地, 未经准备地 )]  )
• 
  注释列句：a short musical passage that seems to have been made spontaneously without advance preparation
• 上位词 -> [passage( n. 通过, 经过, 通道, 通路, (一)段, (一)节 )]  [musical_composition]  [music( n. 音乐, 乐曲 )]  [auditory_communication]  [communication( n. 传达, 信息, 交通, 通讯 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )] 

形容词

• 
  [1.a.impromptu] (同义词:[ad-lib(n.即兴表演 adj. 即兴的, 临时穿插的 v. 在演奏时自由发挥 )]  [extemporaneous( adj. 无准备的, 即席的, 不用讲稿的, 善于即席讲话的, 临时的 )]  [extemporary( adj. 无准备的, 随口说的 )]  [extempore( adj. 即席的, 当场的 adv. 即席, 当场 n. 即席之作 )]  [impromptu( n. 即席演出, 即兴曲 adj. 即席的 adv. 即席地, 未经准备地 )]  [offhand( adj. 即时的, 无准备的, 唐突的 adv. 即时地, 随便地 )]  [offhanded( adj. 立即的, 即席的 )]  [off-the-cuff( adj. 未预备的, 即席的 )]  [unrehearsed]  )
• 
  注释列句：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"
• 近义词 -> [unprepared( adj. 无准备的, 即席的, 尚未准备好的 )] 
  

副词

• 
  [1.r.impromptu] (同义词:[ad_lib( adv. 没有限制地 )]  [ad_libitum( adv. 随意 )]  [spontaneously(adv.自然地, 本能地 )]  [impromptu( n. 即席演出, 即兴曲 adj. 即席的 adv. 即席地, 未经准备地 )]  )
• 
  注释列句：without advance preparation; "he spoke ad lib"