brisk fast hasty hurried quick rapid barreling bolting breakneck breathless careering dizzy fleet flying hurrying lightning meteoric racing rocketing running rushing scooting scudding scurrying snappy speeding speedy swift whirling whirlwind whisking zipping hectic rushed energetic frantic lively zippy nippy blistering galloping rattling hot splitting sudden bustling hastening dashing zooming darting propelling expediting tearing sailing whizzing headlong expeditious prompt nimble sharp accelerated express fleeting expeditive turbo sprightly supersonic ultrafast hypersonic precipitate energizing interesting exciting smart intelligent upright vertical standing energising punctual active eager enthusiastic diligent ready zealous quickie precipitous rash brief short ambitious excited animated enterprising motivated spirited careful caring inspired