extemporaneous
adjective formal uk/ekˌstem.pəˈreɪ.ni.əs/ us/ekˌstem.pəˈreɪ.ni.əs/
即兴的;无准备的;即席的
done or said without any preparation or thought
an extemporaneous speech 即兴演讲
Synonyms: extempore impromptu
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