How to say "smoothly" in Japanese

• スラスラCommon
  adverb (with と)Covers smoothness in the sense of doing something easily and readily, with nothing blocking the flow. Typical of speaking, reading, or writing fluently and without hesitation.
  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!
• とんとんCommon
  adverb (with と)Used when a process or undertaking proceeds smoothly, without a hitch or delay. It describes how events or plans advance, not how a person performs an action skillfully.
• ヌルヌルCommon
  adverb (with と)Limited to smooth movement of CGI, video streaming, and similar on-screen motion; it describes fluid visuals, not fluent speech or a project going well, so it is seldom the right choice outside that context.

Use 「スラスラ」 for fluent, unhindered action or speech, 「とんとん」 for things like work or negotiations proceeding without a hitch, and 「ヌルヌル」 for smooth on-screen motion such as CGI or video streaming.

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

• すらすらsmoothly
• するするsmoothly
• つるりsmoothly
• すっすっsmoothly
• さらっとsmoothly
• スルッとsmoothly
• 滞りなくとどこおりなくwithout delay
• つっとquickly
• とんとんsmoothly (proceed)
• ぬるぬるsmoothly (of CGI movements, video streaming, etc.)
• すんなりsmoothly
• そろりsmoothly
• うまくsuccessfully
• すいすい(progressing) smoothly
• さらさらquickly and easily (e.g. write a letter)