impromptu /ɪmˈprɑːmptu/ Brit /ɪmˈprɒmptju/ adjective /ɪmˈprɑːmptu/ Brit /ɪmˈprɒmptju/
adjective
Learner's definition of IMPROMPTU
: not prepared ahead of time : made or done without preparation无准备的；即兴的；即席的 -
Two of my friends came by unexpectedly, and we had an impromptu little party in my kitchen.我的两位朋友突然到访，于是我们在我家厨房临时搞了个小型聚会。
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He made an impromptu speech about honor and responsibility.他以荣誉和责任为主题做了一场即席演讲。