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"
Composed, performed, or uttered on the spur of the moment, or without previous study; unpremeditated; off-hand; extempore; extemporary; as, an extemporaneous address or production
spoken or done without any preparation or practice = impromptu (extemporaneus, from ex tempore; EXTEMPORE)
önceden yapılan bir hazırlığa dayanmayan
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ön·ce·den ya·pı·lan bir ha·zır·lı·ğa da·yan·ma·yan