at the drop of a hat
instanter
forthwith
on the nail
at a moment's notice
incontinent
instantaneously
unhesitantly
offhand
immediate
tout de suite
like a shot
in the twinkling of an eye
in the blink of an eye
right now
presently
tatkal
instant
unhasting
hotfoot
unapprehensively
immediately
right
straightly
right off
all of a sudden
most Rikki-Tik
straight out of the chute
at one stroke
continuously
one-handed
at once
off the bat
off the rip
insta-
out of the chute
mai tu liao
unhesitatingly
in the wink of an eye
interruptionless
incidentless
interruptless
uninterruptedly
instantly
in a walk
brinkless
point-blank
in a jiffy
toot suite
bain
unhurriedly
surpriseless
untremblingly
eathlins
instantiable
bouncy
standing on one's head
stat
as soon as look at someone
undelayingly
unfearing
this instant
on the spot
ceaselessly
spontaneous
comfortably
from the bottom of one's heart
in a flash
at a canter
golden
fearless
undismayedly
with one hand tied behind one's back
unreluctantly
hit the ground running
with both hands
unstumblingly
unrestrictedly
unstunned
like sixty
swoopstake
in a heartbeat
unskipped
going away
nonskipping
pseudoparticle
straight away
like a duck takes to water
nonstop
undelayedly
right away
surely
unstartled
undazed
unexcitedly
soonest