ex·tem·po·re 
(ĭk-stĕmpə-rē)
(ĭk-stĕmpə-rē)adj.
Spoken, carried out, or composed with little or no preparation or forethought: an extempore speech.
adv.
In an extemporaneous manner.
[Latin ex tempore : ex, of; see EX- + tempore, ablative of tempus, time.]