Translation guide
The concept of familiarity in Japanese is expressed through various words and phrases that convey knowing something well, being accustomed to it, or having a close, informal relationship. The best choice depends on whether you are talking about knowledge, experience, or personal relationships.
Expressing that you know about a topic, are well-informed, or have a basic understanding of it.
Indicates being well-versed or thoroughly knowledgeable in a field. Often used in formal or professional contexts.
彼は日本史に精通している。
He is well-versed in Japanese history.
Means 'knowledgeable' or 'familiar with' in a casual, everyday sense. Commonly used in conversation.
彼はコンピューターに詳しい。
He is knowledgeable about computers.
Conveys thorough knowledge or being intimately familiar with something, often through experience.
彼はその問題を熟知している。
He is thoroughly familiar with the issue.
Literally 'to have knowledge'. A straightforward way to say you are familiar with a subject.
彼は法律の知識がある。
He has knowledge of the law.
Expressing that you are used to a situation, place, or activity because of repeated exposure.
Noun form of 'nareru' (to get used to). Indicates familiarity through habit or experience.
新しい仕事に慣れが必要だ。
You need to get used to the new job.
The most common way to say 'I am used to it' or 'I am familiar with it' in terms of experience.
私は早起きに慣れている。
I am used to waking up early.
Conveys a sense of familiarity combined with affection or comfort, often for places or things.
Describes being skilled and familiar through practice, often used for tasks or procedures.
彼の手慣れた手つきで料理をした。
He cooked with practiced, familiar movements.
Expressing that people know each other well and interact casually, without formality.
The noun for closeness or intimacy in a relationship. Often used to describe the degree of familiarity.
彼らの親しさは誰の目にも明らかだった。
Their familiarity was obvious to everyone.
A common phrase meaning 'close relationship' or 'being on familiar terms'.
彼とは親しい間柄です。
I have a close relationship with him.
Describes a relationship where you can relax and be yourself, free from formality.
Often used for familiar acquaintances or regular customers. Implies a long-standing, comfortable familiarity.
Expressing the negative side of familiarity, where closeness leads to disrespect or inappropriate behavior.
A proverb meaning 'Even between close friends, there should be courtesy.' Used to warn against taking liberties.
親しき仲にも礼儀ありだよ。
You should still be polite even with close friends.
Describes behavior that is overly familiar or presumptuous in a negative way.
彼の馴れ馴れしい態度が嫌だ。
I dislike his overly familiar attitude.
精通 (seitsū) implies deep, often professional expertise, while 詳しい (kuwashii) is more casual and can be used for general knowledge. Use 精通 in formal writing or speeches, and 詳しい in everyday conversation.
彼は法律に精通している。
He is an expert in law.
彼は法律に詳しい。
He knows a lot about law.
The English word 'familiarity' covers many nuances. Direct translation as familiarity (ファミリアリティ) is rarely used. Instead, choose the appropriate Japanese word based on context: knowledge, experience, or relationship.
この町には親しみがある。
I feel a sense of familiarity with this town.
彼は気安い友達だ。
He is a friend I can be at ease with.
彼はこの店の馴染み客だ。
He is a regular customer at this shop.