extemporal

Sir Nathaniel, will you hear an extemporal epitaph on the death of the deer?

Perhaps by chance, this seems to have coincided with the beginnings of the extemporal comedy or commedia dell'arte.

Assist me, some extemporal god of rhyme, for I am sure I shall turn sonnet.

Tarlton quickly became the star of the Queen's Men - "for a wondrous plentiful pleasant extemporal wit, he was the wonder of his time."

It had also led directly to her murder, in a form so dramatic that it hinted more at extemporal desperation than at the careful planning that had been a feature of the treasure thefts.

DAUP: You shall not go; let him be laugh'd at in your stead, for not bringing you: and put him to his extemporal faculty of fooling and talking loud, to satisfy the company.

Humphrey of Gloucester, if thou canst accuse Or aught intend'st to lay unto my charge, Do it without invention, suddenly; I with sudden and extemporal speech Purpose to answer what thou canst object.