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ad lib, ad libitum, spontaneously, impromptu | without advance preparation | ||
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ad-lib, impromptu, offhand, offhanded, extemporaneous, extemporary, extempore, off-the-cuff, unrehearsed | with little or no preparation or forethought | ||
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impromptu | an extemporaneous speech or remark | ||
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impromptu | a short musical passage that seems to have been made spontaneously without advance preparation |