unprepared
ad-lib
extemporaneous
extemporary
extempore
offhand
offhanded
unpremeditated
unrehearsed
12-minute
bomber-style
bristed
byintelligence
casuistical
challengingthe
even-toned
midmost
miscellaneous
montuno
night-a
over-polite
peppy
picture-in-picture
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unpunctuated