すらすらsurasura

1. adverb (with と)smoothly; easily; readily
   彼かれはなんて英語えいごをすらすら話はなすだろう。↗

   How fluently he speaks English!

• SynonymスイスイCasualColloquial. Light, gliding progress, as if swimming; leans toward physical movement, where スラスラ is about speech or reading flowing without a hitch.
• SynonymするするCasualColloquial. Suggests something sliding along smoothly, often physical movement like 「するする登る」; スラスラ is about fluent speech, reading or answers.
• SynonymすんなりNeutralNeutral. Getting something done with no resistance, and also a slim figure; leans more toward how things progress than スラスラ's fluent speech or reading.
• Relatedトントン拍子とんとんびょうしNeutralNeutral. Things going smoothly one after another, as with promotions or marriage plans; describes how events unfold, not fluent speech like スラスラ.
• RelatedさらっとCasualColloquial. Doing something readily and matter-of-factly, without fuss; feels lighter and more casual than スラスラ.
• AntonymどもりながらNeutralStammering, with speech catching and stalling — the opposite of the fluent speaking that スラスラ describes.
• AntonymつっかえながらNeutralStumbling, getting stuck partway through reading or writing — the opposite of the smooth flow スラスラ describes.

Use 「スラスラ」 for speaking, reading, writing or answering without a hitch, as in 「スラスラ読める」「スラスラ答える」. For light, gliding movement say 「スイスイ」; for things going through smoothly, 「すんなり」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 途中とちゅうで閊つかえたり滞とどこおったりせずに順調じゅんちょうに進すすむさま。