Impromptu
/ˌɪˈmprɑmptu/
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Definition
(adj) Improvised; without prior preparation, planning or rehearsal.
Sentence Examples
It usually takes me more than three weeks to prepare a good impromptu speech.
I called a few friends and we had an impromptu party.
CEFR Practice Quiz
The group of friends had an ____ party to celebrate their unexpected day off from work.