How to Simply Use “Worry about ____” in Japanese for Beginners

When something goes wrong and you just can’t stop thinking about it, Japanese has a perfect word for that feeling: くよくよする. But how is it different from 心配しんぱいする, the more common word for “to worry”? Understanding the difference will help you express yourself more naturally in Japanese.

Yuka

Rei, what does くよくよする mean? Is it the same as 心配しんぱいする?

Rei

Not quite! くよくよする means you keep dwelling on something — usually something that has already happened — and you can’t let it go. 心配しんぱいする is about worrying about something that might happen in the future. くよくよ is more about brooding over the past.

At a Glance

くよくよする (kuyokuyo suru) — Brooding and Dwelling

When you can’t stop thinking about what went wrong

くよくよする means someone has been worrying over something for a long time, becoming withdrawn as a result. It is often used when a friend is struggling with a breakup, a failure, or a loss. The encouraging phrase is: くよくよしないで — “Don’t dwell on it!”

Yuka

過去かこの失敗しっぱいをくよくよ考かんがえないで。 (Don’t dwell on your past failures.)

Rei

ありがとう。出来できるだけ考かんがえないようにするよ。 (Thanks! I’ll try not to think about it as much as possible.)

Yuka

あー、試験しけんに落おちたしもう人生じんせいの終おわりだよ。 (Ahhh, my life is over because I failed the exam.)

Rei

過去かこのことをくよくよするなって。 (Don’t brood over the past.)

Yuka

たった１回失敗いっかいしっぱいしたくらいでくよくよするなー！ (You messed up just once. You don’t need to dwell on it.)

Rei

元気出げんきでたよ！ありがとう！ (I feel better now! Thank you!)

Yuka

ささいなことでくよくよしないで。 (Don’t worry about the small stuff!)

Key Differences and Common Mistakes

The key difference is time-focus: くよくよする is about past events you cannot change, while 心配しんぱいする covers both present and future uncertainties. Saying くよくよするな to someone future-facing would sound odd — use 心配しんぱいしないで instead.

Quick Quiz

Fill in the blank with くよくよする or 心配しんぱいする

1. 明日の試験のことが（　　　）。(I’m anxious about tomorrow’s exam — future concern)
2. あの件でずっと（　　　）ないで。(Don’t keep brooding over that matter — past event)
3. 彼女のことが（　　　）。(I’m worried about her — current concern)

Answers: 1. 心配しんぱい / 2. くよくよし / 3. 心配しんぱい

くよくよする is the word you need when someone is stuck in a loop, replaying past mistakes in their head. The next time your friend is brooding, tell them: くよくよしないで！ You’ll sound like a natural Japanese speaker right away.

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