すっとsutto

1. adverb, suru verbstraight; quickly; directly; all of a suddenスーッと and すうっと are more emphatic
   彼かれはそのそばでシャツをすうっと着きた。↗

   He slipped the gaudy shirt on.

   カタツムリがすっと角かどを出だした。↗

   The snail shot out its horns.
2. adverb, suru verbquietly; gently; softly
3. suru verbto feel refreshed; to feel satisfied

• SynonymさっとNeutralQuick, crisp movement, and also sudden wind or rain, as in 「さっと手を挙げる」; 「すっと」 is softer and smoother, and can also describe a refreshed feeling.
• SynonymつっとWrittenA quick, light movement, as in 「つっと立ち上がる」; found mostly in fiction — in everyday speech 「すっと」 or 「さっと」 is more common.
• SynonymつとWrittenA sudden single movement, or staying perfectly still; literary, as in 「つと立ち上がる」 — in daily speech use 「すっと」 or 「急に」.
• SynonymついとWrittenA quick movement that catches someone off guard, as in 「ついと横を向く」; mostly in fiction; 「すっと」 stresses a softer, smoother motion.
• Relatedいち早くいちはやくNeutralStresses getting ahead of others without delay, as in 「いち早く駆けつける」; 「すっと」 describes the light, smooth motion itself.
• Related早くはやくNeutralMeans early or fast, as in 「早く来て」; it is about time and speed, and, unlike 「すっと」, does not picture the graceful lightness of a movement.
• Related早速さっそくNeutralGetting straight to something at once, as in 「早速始めよう」; it stresses acting immediately, while 「すっと」 depicts the smooth, unimpeded motion itself.
• RelatedみるみるNeutralRapid change unfolding before your eyes, as in 「みるみる元気になる」; it stresses change happening in view, while 「すっと」 usually depicts a single action.
• Related早々そうそうNeutralMostly after a noun meaning just after something, as in 「開店早々」; also hurriedly or early; it is about timing, not the manner of a movement.
• Related迅速じんそくWrittenA Sino-Japanese word for speed and promptness, as in 「迅速な対応」; common in formal prose like news and business, while 「すっと」 is a mimetic word for movement.
• RelatedさっさとCasualColloquial: finishing quickly without hesitation, as in 「さっさと帰る」, sometimes with an urging tone; it is about getting things done fast, not the soft grace of 「すっと」.
• RelatedパッとCasualColloquial mimetic word for something bursting open, lighting up or standing out at once, as in 「パッと明るくなる」; more sudden and striking than 「すっと」.
• RelatedたちまちWrittenWritten: something turns into a new state in an instant, as in 「たちまち売り切れる」; it stresses the speed of change, while 「すっと」 stresses light, smooth motion.
• RelatedすぐにNeutralRight away with no time in between, as in 「すぐに返事する」; it stresses the short time, while 「すっと」 paints the lightness of the movement.
• RelatedすぐNeutralRight away, or very close in distance, as in 「すぐ行く」「すぐそこ」; it is about short time or distance, not the manner of a movement.
• RelatedキビキビNeutralA mimetic word for brisk, energetic movement or speech, as in 「きびきび働く」; it suggests a sustained manner, while 「すっと」 is one quick motion.
• RelatedするするCasualColloquial mimetic word for continuous smooth, unobstructed movement or progress, as in 「するする登る」; 「すっと」 is a single light motion.
• RelatedとっととCasualColloquial: hurry along, often in commands with a rough, brusque tone, as in 「とっとと出ていけ」; 「すっと」 carries no such tone.
• RelatedばっとCasualColloquial mimetic word for bursting apart or moving with a jerk; stronger than 「パッと」 and far more forceful than the gentle 「すっと」.
• Related見る間にみるまにNeutralBefore your eyes, in the blink of an eye, as in 「見る間に消えた」; it stresses change happening rapidly in view, close to 「見る見る」.

For one light, smooth, quick movement, 「すっと」 is the default. Use 「さっと」 for a crisp motion, 「さっさと」 for briskly getting a task done, 「すぐ」 or 「早速」 for right away, 「たちまち」 for change in the blink of an eye, and 「パッと」 for something bursting open at once.

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

1. 素早すばやく、軽かろやかに動作どうさや変化へんかするさま。
2. 細ほそく真っ直まっすぐに伸のびるさま。
3. 心中しんじゅうにわだかまっていたものなどが無なくなり、気持きもちがすっきりするさま。