|1.||[ adjective ] with little or no preparation or forethought|
|Synonyms:||extemporaneous extemporary extempore off-the-cuff offhand offhanded unrehearsed ad-lib|
"his ad-lib comments showed poor judgment" "an extemporaneous piano recital" "an extemporary lecture" "an extempore skit" "an impromptu speech" "offhand excuses" "trying to sound offhanded and reassurin
|2.||[ adjective ] in response to an unforeseen need|
"an impromptu speech" "a spur-of-the-moment party"
|3.||[ noun ] an extemporaneous speech or remark|
"a witty impromptu must not sound premeditated"
|4.||[ adverb ] without advance preparation|
|Synonyms:||ad_lib spontaneously ad_libitum|
"he spoke ad lib"
|5.||[ noun ] (music,fine art) a short musical passage that seems to have been made spontaneously without advance preparation|