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WordNet (r) 3.0 (2006) (WordNet)

extemporary
adj 1: 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" [synonym: {ad-lib},
{extemporaneous}, {extemporary}, {extempore},
{impromptu}, {offhand}, {offhanded}, {off-the-cuff},
{unrehearsed}]