しばらく (translations)→ awhile bit briefly calculated continue hi moment remain second some temporarily while
すぐ (translations)→ automatically close closely directly dutifully easily easy first immediately instantaneously instantly just now present presently pronto quick quickly quite right simply soon swiftly then very willingly
とたん (translations)→ as until when
とたんに (translations)→ inevitably noticeably suddenly
わずかな (translations)→ conservative fugitive meager minimal perceptibly scant scanty slightest slightly
一瞬 (translations)→ blinking brief flash fleeting glance heartbeat instant momentary next once sec split-second time