off the top of head
ADJECTIVE
extemporaneous/extemporary
Synonyms
WEAK
ad hoc
ad lib
at first glance
automatic
by ear
casual
expedient
extempore
free
immediate
impromptu
improv
improvisatory
improviso
informal
jamming
made-up
makeshift
off the cuff
offhand
on impulse
on-the-spot
snap
spontaneous
spur-of-the-moment
taking for ride
thought out loud
tossed off
tossed out
unplanned
unpremeditated
unprepared
unstudied
winging it
Antonyms
ADJECTIVE
offhand
Synonyms
STRONGEST
WEAK
Antonyms
ADJECTIVE
precipitous/precipitate
Synonyms
WEAK
abrupt
breakneck
brief
frantic
gone off half-cocked
harum-scarum
hasty
headlong
heedless
hurried
ill-advised
impatient
impetuous
indiscreet
jump the gun
madcap
off the hip
plunging
precipitant
quick
rapid
rash
reckless
refractory
rushing
subitaneous
swift
unanticipated
uncontrolled
unexpected
unforeseen
violent
willful
without warning
Antonyms
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.