クスクス

• Reading: くすくす
• Romaji: kusu kusu
• Pronunciation: /kɯ.sɯ.kɯ.sɯ/

Meaning

Giggling, snickering, or laughing quietly — often behind one's hand or trying to suppress laughter.

クスクス is the sound of stifled, quiet laughter. It can be innocent — friends sharing a private joke and trying not to laugh out loud — or it can be mean-spirited, like snickering at someone behind their back. The context determines whether it's endearing or cruel. When you hear people クスクス笑う about you, it often feels like being talked about, creating an uncomfortable feeling.

Examples

1. 授業中にクスクス笑ってたら先生に怒られた。 We got in trouble with the teacher for giggling during class.
2. 後ろでクスクス笑われてる気がして振り向いた。 I felt like people behind me were snickering, so I turned around.
3. 二人でクスクス笑いながらヒソヒソ話してた。 The two of them were whispering and giggling together.

Usage Guide

Context: daily life, school, social situations

Tone: quiet, secretive

Do Say

• 面白くてクスクスしちゃった (It was funny and I couldn't help giggling)
• クスクス笑いが止まらなかった (I couldn't stop snickering)

Don't Say

• 人の前でクスクス笑うと陰口に見える (Snickering in front of someone looks like you're making fun of them)

Common Mistakes

• Always assuming クスクス is mean-spirited — it can be innocent giggling between friends too
• Confusing with ゲラゲラ — クスクス is specifically quiet, suppressed laughter

Origin & History

Onomatopoeia imitating the sound of suppressed, quiet laughter. The くす sound captures the soft exhale of trying to hold back a giggle. Long established in Japanese for describing discreet laughter.

Cultural Context

Era: Traditional onomatopoeia

Generation: All ages

Social background: Universal

Regional notes: Used across all of Japan. Common in school settings and in manga to depict background characters whispering and giggling.