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Spur-of-the-moment
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Thesaurus
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
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