briefly
fleetingly
flickeringly
flittingly
for a moment
immediately
in an instant
instantaneously
instanter
instantly
just now
just then
momentaneously
momently
on the dot
on the instant
on the nail
on the spot
quickly
shortly
swiftly
transiently
customarily
extraordinarily
merrily
militarily
necessarily
ordinarily
primarily
secondarily
temporarily
voluntarily
warily
wearily