How to say "informal" in Japanese

• 手軽てがるJLPT N1approx.Common
  na-adjective, nounCovers 'informal' in the sense of easy and requiring little effort or formality — an informal, hassle-free meal or procedure. The emphasis is on convenience and simplicity rather than on dress or official status.
  年来ねんらいの経済けいざい病びょうには手軽てがるにきく万能薬ばんのうやくなどありません。↗

  There is no easy cure-all for old economic ills.
• カジュアルCommon
  na-adjectiveCovers 'informal' in the sense of casual style or atmosphere — informal clothes, a relaxed dress code, an easygoing manner. A loanword typically used for fashion and social settings rather than official or legal matters.
• 略式りゃくしきCommon
  no-adjective, na-adjectiveCovers 'informal' as 'simplified': a shortened or streamlined version of a formal procedure, such as an informal trial or ceremony. It suggests something abbreviated from a full formal process, so it suits institutional and legal contexts.
• 非公式ひこうしきCommon
  no-adjective, na-adjectiveCovers 'informal' meaning unofficial — an informal meeting, agreement, or visit that carries no official standing. It directly contrasts with 正式 and is the natural choice when the point is lack of official status.
  ウーマン・リブは底辺ていへんは広ひろいが、非公式ひこうしきな民衆みんしゅうの運動うんどうである。↗

  Women's Liberation is a broad-based but informal popular movement.
• 内々うちうちCommon
  no-adjective, adverbCovers 'informal' in the sense of private and confidential — an informal discussion kept among insiders rather than made public. Use it when the informality is about secrecy or a closed circle, not style or procedure.
  このことは内々ないないにしてください。↗

  Please keep this a secret.

Choose 手軽 for ease and convenience, 「カジュアル」 for relaxed dress or style, 略式 for simplified procedures, 非公式 for unofficial status, and 内々 for matters kept private within a circle.

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

• 手軽てがるeasy
• カジュアルcasual
• 略式りゃくしきinformal
• 非公式ひこうしきinformal
• 内々うちうちprivate
• インフォーマルinformal
• 柔らかいやわらかいlight (topic, book, etc.)
• 柔らかやわらかinformal
• くだけたinformal (e.g. greeting, expression)
• サンダル履きサンダルばきinformal