a corps perdu
abruptly
agilely
amain
apace
at flank speed
at half cock
at once
bang
by forced marches
carelessly
cursorily
dash
desperately
directly
double-quick
expeditiously
fast
feverishly
flat-out
furiously
hand over fist
hand over hand
happen what may
head over heels
headfirst
headforemost
headlong
heedlessly
heels over head
hell for leather
hell-bent
hell-bent for election
helter-skelter
holus-bolus
hotfoot
hotheadedly
hurriedly
hurry-scurry
immediately
impatiently
impetuously
impulsively
in a flash
in a rush