内輪|うちわuchiwa[0]heiban (flat)

1. no-adjectivefamily circle; one's circle (of friends, co-workers, etc.); one's fellows; in-group
   その浮気うわきは内輪うちわの秘密ひみつだ。↗

   That love affair is a family secret.
2. no-adjectiveprivate matters; internal affairs
3. na-adjective, no-adjectiveconservative (e.g. estimate); moderate
4. nounpigeon toe (walking); in-toeing

• Related非公式ひこうしきNeutralInformal or unofficial, as in 「非公式会談」; stresses the lack of formality, while 「内輪」 stresses being within one's own circle.
• Related個人的こじんてきNeutralPersonal or private; stresses an individual's own standpoint, and does not suggest a small circle of insiders.
• RelatedプライベートNeutralLoanword for private matters or one's private life; stresses personal privacy rather than a circle of insiders.
• RelatedパーソナルNeutralLoanword meaning personal or for personal use, as in 「パーソナルカラー」; mostly used in compounds.
• Antonym外部がいぶNeutralAntonym: the outside or outside world, e.g. of a group or building; the opposite of the inner circle of 「内輪」.
• Antonym外様とざまNeutralAntonym: an outsider, someone not of the inner circle; originally an Edo-period outside daimyo. Opposite of 「内輪」's own people.

Use 「内輪」 for one's own circle of family, friends or colleagues, as in 「内輪揉め」「内輪の話」, and for conservative estimates. Say 「非公式」 for informal or unofficial, 「プライベート」 for private life and privacy; 「外様」「外部」 are antonyms for outsiders and the outside.

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

1. カーブを曲まがる時ときに内側うちがわになる車輪しゃりん。