Noun
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a short musical passage that seems to have been made spontaneously without advance preparation
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an extemporaneous speech or remark
"a witty impromptu must not sound premeditated"
Adjective
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with little or no preparation or forethought
"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 reassuring"
"an off-the-cuff toast"
"a few unrehearsed comments"
- ad lib - off the cuff
Adverb
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without advance preparation
"he spoke ad lib"
- ad lib - ad libitum