in the twinkling of an eye
in the blink of an eye
right now
presently
instanter
right
instant
tatkal
straight out of the chute
most Rikki-Tik
tout de suite
at one stroke
at once
in the wink of an eye
off the bat
off the rip
out of the chute
right off
at a moment's notice
stat
immediate
in a flash
this instant
insta-
proximally
forthwith
at the drop of a hat
nowish
flash
offhand
immediately
this minute
right away
straight away
on the double
then and there
slap-bang
shine
in a snap
on the nail
incontinent
pseudoparticle
⠊⠍⠍
instantiable
straightly
break into
now-now
hereupon
instantaneousness
pronto