impromptu
adjective uk/ɪmˈprɒmp.tʃuː/ us/ɪmˈprɑːmp.tuː/
无准备的,即兴的
done or said without earlier planning or preparation
an impromptu party/performance 临时晚会/即兴表演
Synonyms: off the cuffextemporaneous extempore
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