あっけなく (translations)→ deft easily freely
あっさり (translations)→ brightly carelessly casual dryly effortlessly entirely handsomely impatiently just matter-of-factly off-hand readiness short shortly simply succinctly thinly unceremoniously willing
あっという間に (translations)→ immediately instantly rapidly swiftly
あわてて (translations)→ breathlessly confusion eventually frantic hastily hasty hurriedly promptly retreat rush suddenly wildly
いっぺんに (translations)→ all simultaneously
いつの間にか (translations)→ absentmindedly naturally occasionally
おいそれと (translations)→ hard readily unwilling
さっさと (translations)→ abruptly briskly directly early pronto quick soon thoughtlessly
さっそく (translations)→ present right straight very
さっと (translations)→ brief briefly casually effectually fling lightly severely sharp sharply swing whisk
ざっと (translations)→ about abstracted cursory glancingly rough roughly slightly so some
すかさず (translations)→ already automatically smoothly
すぐ (translations)→ close closely dutifully easy first instantaneously minute now presently quite then willingly
すぐさま (translations)→ fast immediate instant
すっと (translations)→ clear irresistibly revived slip
すばやく (translations)→ cursorily deftly speedy
せかせかと (translations)→ busily jauntily nervous nervously urgently
そそくさと (translations)→ precipitously scurry scuttle sudden uneasily
そっと (translations)→ calmly carefully cautiously covertly delicately discreetly ease furtive furtively gently gingerly guardedly little loosely politely quiet quietly secretly silently slight slowly softly stealthily stealthy tenderly tentative
その場で (translations)→ synchronous there
たちまち (translations)→ completely instantaneous momentarily outright speedily
たちまちのうちに (translations)→ sight
ちょっと (translations)→ almost bit brisk but faintly fairly few hey hi jiffy maybe merely mildly moment nearly nominal pinch pretty psst pure rather sec small something somewhat sort subtly totally touch tut while
ちらっと (translations)→ flash glance slide
てきぱきと (translations)→ expertly promptness rapid
とたんに (translations)→ inevitably noticeably when
とっさに (translations)→ impulsively still
どんどん (translations)→ aggressively constantly dramatically eagerly fair good gradually increasingly keep steadily
はっと (translations)→ alarm alert dead jolt start startle
はやい (translations)→ only precede
ぱっと (translations)→ excitedly fly
ぴしゃりと (translations)→ curtly keen resoundingly
みるみる (translations)→ perceptibly visibly well
もう (translations)→ again another anymore beforehand extra further God indeed more perfectly point real yes
一気に (translations)→ mouthful single through vigorously
急ぐ (translations)→ chop hurry prompt push race sprint stride
急に (translations)→ begin considerably snap
迅速 (translations)→ speed velocity
大急ぎで (translations)→ amain feverishly
すぐに (translations)→ forthwith in a bit straightaway