impromptu

adj : in response to an unforeseen need; "an impromptu speech"; "a

spur-of-the-moment party" [syn: {spur-of-the-moment}]

n 1: an extemporaneous speech or remark; "a witty impromptu must

not sound premeditated"

2: a short musical passage that seems to have been made

spontaneously without advance preparation

adv : without advance preparation; "he spoke ad lib" [syn: {ad lib},

{ad libitum}, {spontaneously}]