あっという間に の訳語→ immediately instantly quickly rapidly
あわただしく の訳語→ fly hastily hurry restively
さっそく の訳語→ directly present promptly right straight very
さっと の訳語→ abruptly brief briefly briskly casually effectually fling lightly quick severely sharp sharply suddenly swing whisk
すぐ の訳語→ automatically close closely dutifully easily easy first instantaneously just minute now presently pronto quite simply soon then willingly
すばやく の訳語→ cursorily deftly hasty immediate speedy
せかせかと の訳語→ busily jauntily nervous nervously urgently
たちまち の訳語→ already completely instantaneous momentarily outright short speedily sudden
はっと の訳語→ alarm alert dead hurriedly jolt start startle
みるみる の訳語→ dramatically perceptibly visibly well
急に の訳語→ begin considerably snap