Synonyms:
- ad lib,
- ad libitum,
- ad-lib,
- casual,
- caught napping,
- caught off balance,
- caught short,
- extemporary,
- extempore,
- extemporized,
- haphazard,
- hasty,
- impromptu,
- improvisatorial,
- improvise,
- improvised,
- improviso,
- impulsive,
- informal,
- jury-rigged,
- makeshift,
- off the cuff,
- off-the-cuff,
- offhand,
- precipitate,
- rough-and-ready,
- snap,
- spontaneous,
- spur-of-the-moment,
- stopgap,
- surprised,
- taken aback,
- taken by surprise,
- taken unawares,
- tripped up,
- unarranged,
- unbegun,
- unconcocted,
- uncontrived,
- undeliberated,
- undevised,
- unhatched,
- unmade,
- unmanufactured,
- unorganized,
- unplanned,
- unpremeditated,
- unprepared,
- unprimed,
- unready,
- unrehearsed,
- unstudied