amain apace at flank speed at once by forced marches cursorily double-quick expeditiously fast feverishly furiously hand over hand hastily hell for leather hell-bent hell-bent for election helter-skelter hotfoot hurriedly hurry-scurry immediately in double time in double-quick time in high in high gear in passing in seven-league boots instantly lickety-cut lickety-split on the double on the run pell-mell post posthaste promptly quick quickly rapidly slapdash snappily speedily superficially swiftly trippingly under forced draft whip and spur with a rush with all haste with dispatch with giant strides with haste with rapid strides with speed