extempore

adj.
Spoken, carried out, or composed with little or no preparation or forethought. See synonyms at extemporaneous.

adv.
In an extemporaneous manner.

[Latin ex tempore : ex, of; see ex- + tempore, ablative of tempus, time.]

adjective

Spoken, performed, or composed with little or no preparation or forethought: ad-lib, extemporaneous, extemporary, impromptu, improvised, offhand, snap, spur-of-the-moment, unrehearsed. Informal off-the-cuff. See prepared/unprepared.

adj

Definition: impromptu
Antonyms: planned, rehearsed

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extempore [iks‐tem‐pǒ‐ri], composed on the spur of the moment, without preparation. Some kinds of oral poetry involve a degree of extemporization.

verb: extemporize.

without preparation (lit., from the moment)