Translation guide
The English word "improper" covers a range of meanings from morally wrong or indecent to incorrect or unsuitable according to rules or standards. This guide helps learners choose the right Japanese expression based on the intended nuance.
Describing behavior, speech, or content that is sexually inappropriate, obscene, or morally offensive.
General term for 'inappropriate' or 'improper', often used for remarks or behavior that are socially or morally unacceptable.
彼の不適切な発言が問題になった。
His improper remarks became a problem.
Specifically means 'obscene' or 'indecent', used for sexually explicit content or acts.
わいせつな画像を送るのは犯罪です。
Sending obscene images is a crime.
Describes lewd or indecent behavior, often with a nuance of being sexually loose. Somewhat literary or old-fashioned.
みだらな行為は慎むべきだ。
Improper conduct should be avoided.
Describing actions, procedures, or methods that are incorrect, irregular, or not in accordance with established rules or etiquette.
Again the most common and versatile term for 'improper' in the sense of being unsuitable or not conforming to standards.
不適切な手続きで契約が無効になった。
The contract was invalidated due to improper procedures.
Means 'inappropriate' or 'unsuitable', often used when something does not meet the required conditions or is not fitting.
Means 'illegal', 'unjust', or 'improper' in the sense of being against rules or laws. Often used for fraud or misconduct.
Means 'unjust' or 'unfair', often used for improper treatment or decisions that violate rights or fairness.
Describing behavior that is rude, impolite, or not in keeping with social etiquette.
Common word for 'rude' or 'impolite'. Can be used for minor breaches of etiquette.
人前であくびをするのは失礼だ。
It's improper to yawn in front of people.
Means 'ill-mannered' or 'impolite', often referring to breaches of social convention or etiquette.
Similar to 不作法, meaning 'rude' or 'ill-mannered'. Slightly more formal or literary.
Describing something that is factually wrong, mistaken, or not correct according to a standard.
Means 'inaccurate' or 'incorrect'. Used when information or data is not correct.
不正確な情報を流してはいけない。
You must not spread improper information.
Means 'mistaken' or 'erroneous'. Often used for wrong decisions or beliefs.
誤った判断で会社は損害を受けた。
The company suffered losses due to an improper decision.
Means 'improper' or 'inadequate' in the sense of not meeting a required standard, often used in legal or technical contexts.
不適正な会計処理が発覚した。
Improper accounting practices were uncovered.
不適切 is the most general term for 'improper' and can be used in many contexts. 不適当 emphasizes unsuitability or inappropriateness for a specific purpose. 不正 implies illegality or violation of rules, often used for fraud or misconduct.
While 不適切 is versatile, it may not convey the specific nuance of indecency (use わいせつ) or rudeness (use 失礼). Choose the word that best matches the intended meaning.
この書類は不適当なので受理できません。
This document is improper and cannot be accepted.
He obtained money through improper means.
They protested against the improper dismissal.
Making noise while eating is improper.
I was surprised by his improper attitude.