RichThesaurus
do offhand
do offhand
synonyms
invent
devise
ad-lib
improv
make up
wing it
improvisate
extemporize
speak off the cuff
knock off
make do
concoct
fake it
throw together
slapdash
spark
improvise
play it by ear
dream up
jam
play by ear
dash out
do off top of head
brainstorm
contrive
toss off
do off the top of your head
coin
fake
dash off
do offhand
antonyms
plan
prepare
premeditate
read
rehearse
design