(very) quick; rapid; swift; speedy; prompt; expeditious
sudden peal of thunder; thunderclap
furious (energy, battle, etc.); frenzied (work, activity, etc.); ferocious
rousing oneself fiercely; being intensely stirred up
the (fast) pace at which life passes, and thus the nearness of death; promptitude of the changes of the times
quick and decisive; fast and daring
quick and decisive; fast and daring; swift and resolute
violent thunder and fierce wind; rapidly changing situation; swift action