at the spur of the moment, off the cuff, improvised
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Uses:
I was elated, for I had succeeded in avoiding the suck. I started to raise my death-chant again— a purely extemporised farrago of a drug-crazed youth. “Don’t sing— yet,” whispered John Barleycorn.
Jack London. John Barleycorn
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the Charade you made last Night extempore at Mrs. Drowzie's conversazione
R.B. Sheridan. The School for Scandal
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She was only extemporizing, but a stirring warmth flowed from her,
F. Scott Fitzgerald. The Great Gatsby.
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and even though I will concede that my extemporaneous remarks might have been influenced by his sitting there with that look on his face