すかさず (translations)→ already automatically immediately instantly promptly quick quickly simultaneously straight
すらすら (translations)→ easily easy
すらすらと (translations)→ fast lucidly readily silkily smooth
つつがなく (translations)→ nicely officially routinely safely
やんわり (translations)→ delicately diplomatically gently lightly mildly politely slightly softly
よどみなく (translations)→ comfortably flowingly rolling
楽々と (translations)→ effortlessly
苦もなく (translations)→ clear effortless simply
順調に (translations)→ right smoothness successfully