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How to sign: 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;
Similiar / Same: extemporaneous, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed, ad-lib