extempore
ex tempore
ad lib
cold
unprepared
extemporarily
extemporaneously
ad libitum
impromptu
spontaneously
preparingly
off the cuff
unpredestinated
improvise
extemporize
extemporise
improvize
ad-lib
preparatively
uncontemporaneous
noncontemporaneous
ad-libbed
ready-made
off-the-cuff
off the top of one's head
unpracticed
extemporaneous
nonmethodical
unmethodical
impracticable
offhand
unsystematical
offhanded
unrehearsed
extemporary
nonresumptive
nondysfunctional
unpractised
postpreparative
nonroutine
unversed
noniodized
inefficaciously
pretraining
preparative
indextrous
unexpeditated
nonmanual
prepreparation
non-prerequisite