extemporaneous
🇺🇸
/ɪkˌstempəˈreɪniəs/
🇬🇧
/ɪkˌstempəˈreɪniəs/
adjective
R
spoken or performed without prior preparation
The student delivered an extemporaneous speech that impressed everyone in the class.
该学生发表了一次即兴演讲，给班上的每个人留下了深刻印象。
translation
即兴的