1. With little or no preparation or forethought
   "an extemporary lecture"
   - ad-lib, extemporaneous, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed

See also: extemporarily, unprepared

• organismic
• organist
• organizable
• organization
• organization chart
• organization expense
• Organization for the Prohibition of Chemical Weapons
• organization man
• Organization of American States
• Organization of Petroleum-Exporting Countries
• Organization of the Oppressed on Earth
• organizational
• organizational chart
• organizationally
• organize
• organized
• organized crime
• organized labor
• organized labour
• organized religion
• organizer
• organo-
• organogenesis
• organogram
• organoleptic