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 impetuously impulsively in a flash in a rush in a wink in double time in double-quick time in high in high gear in passing in seven-league boots incautiously instantaneously instantly lickety-cut lickety-split like a flash like a shot like a thunderbolt like crazy like greased lightning like mad madly nimbly of a sudden on short notice on the double on the run overeagerly overenthusiastically overhastily oversoon overzealously pell-mell plop plump plunk pop post posthaste precipitantly precipitately precipitously prematurely promptly pronto quick quickly ramble-scramble rapidly rashly recklessly right away sharp slam-bang slap slap-bang slapdash smack snappily speedily startlingly sudden suddenly superficially surprisingly swiftly thoughtlessly too early too soon trippingly unawares under forced draft unexpectedly unpremeditatedly unthinkingly untimely wantonly whip and spur wildly with a rush with all haste with dispatch with giant strides with haste with rapid strides with speed without delay without notice without warning