How to Say I'm Worried in Japanese: Shinpai, Ki Ni Naru and Fuan

Shinpai: the everyday word for worry

心配 (shinpai) combines the kanji for heart and for distributing or attending to, and it is the standard word for worry. It works as a noun, a na-adjective and, with suru, a verb. Shinpai desu means I'm worried; shinpai shite imasu means I'm worrying, often about a person. The thing you worry about takes ga with shinpai desu and o with shinpai suru.

Shinpai is neutral and can be used almost anywhere, from chatting with friends to talking to a doctor. The difference lies in the ending: shinpai casually, shinpai desu politely, and go-shinpai when referring respectfully to someone else's concern.

Ki ni naru: when something is on your mind

気になる (ki ni naru) means something catches your attention and stays on your mind. It covers light worries, like a message that has not been answered or a strange sound from the washing machine, and it also covers curiosity or interest, as in ki ni naru hito, someone you are interested in. Context tells you which.

Ki ni shinaide, don't let it bother you, is a common kind reply when someone apologises for something small. The related ki ni suru means to mind or to worry about something, often more than necessary.

Fuan and kokoro-bosoi: anxiety and feeling alone

不安 (fuan) literally means not at ease. It is a heavier, more general word than shinpai, describing anxiety or insecurity, especially when the future is uncertain: a new job, living alone abroad, money or health. Fuan desu and fuan ni naru, to start feeling anxious, are both common. Fuan na kimochi is an uneasy feeling.

心細い (kokoro-bosoi), literally thin-hearted, describes the helpless, lonely feeling of being without support: arriving in a new country, being home alone during a storm, or waiting for news in hospital. It is a softer, sadder word than fuan, and very natural when talking about the first weeks in Japan.

Comparing the worry words

These words overlap, but each has a centre of gravity. Use the table to choose the one that matches what you actually feel.

Kinchō suru is worth knowing alongside these: before a presentation or interview, Japanese speakers usually say kinchō shite imasu, I'm nervous, rather than shinpai.

Reassuring someone: shinpai shinaide and daijōbu

The most common way to say don't worry is 心配しないで (shinpai shinaide). Shinpai nai yo, there's nothing to worry about, and daijōbu da yo, it'll be fine, are just as natural among friends. Politely, say shinpai shinaide kudasai or daijōbu desu yo.

In formal speech, especially in business or customer service, you will hear go-shinpai naku, please do not worry, often followed by an explanation of what will happen next. Reassurance in Japanese usually sounds best when it is short and practical rather than emotional.

What people say back

When someone worries about you, the typical Japanese response is to apologise for causing the worry, then thank them. Go-shinpai o okake shimashita, I'm sorry to have worried you, is standard in polite speech; casually, shinpai kakete gomen ne. Then add arigatō or a quick update to show you are all right.

Common mistakes with worry words

• Using the wrong particle. Say shiken ga shinpai desu with shinpai desu, but shiken o shinpai suru with the verb. Mixing them sounds off.
• Saying shinpai desu before a speech or interview. Kinchō shite imasu, I'm nervous, fits better when the feeling is nerves rather than worry.
• Treating ki ni naru as only negative. It often means curiosity or interest, so ki ni naru hito is someone you like, not someone who worries you.
• Replying to kindness with just arigatō. When someone was worried about you, go-shinpai o okake shimashita sounds more natural first.
• Over-reassuring. Repeating daijōbu many times can sound dismissive; listen first, then offer one short line of comfort.
• Using fuan for small things. Fuan desu about a late bus sounds dramatic; chotto shinpai or ki ni naru is lighter.