Translation guide
This guide covers how to express that something is absolutely necessary or indispensable in Japanese. It includes common words, phrases, and patterns for emphasizing necessity, from everyday conversation to formal writing.
To say that something is absolutely necessary and cannot be done without.
The most common and versatile word for 'indispensable' or 'essential'. Used in both spoken and written Japanese.
水は生きるために不可欠だ。
Water is absolutely necessary for life.
このプロジェクトには彼の協力が不可欠です。
His cooperation is absolutely necessary for this project.
Means 'required' or 'mandatory'. Often used for things that are compulsory or a must-have.
この書類は必須です。
This document is absolutely necessary.
スマホは現代生活に必須のアイテムだ。
A smartphone is an absolutely necessary item in modern life.
A common phrase meaning 'cannot do without' or 'indispensable'. More conversational than 不可欠.
彼はこのチームになくてはならない存在だ。
He is an absolutely necessary member of this team.
辞書は語学学習になくてはならない。
A dictionary is absolutely necessary for language learning.
Similar to なくてはならない, meaning 'indispensable' or 'essential'. Slightly more formal.
睡眠は健康に欠かせない。
Sleep is absolutely necessary for health.
To emphasize that something must be done or is absolutely required, often in rules or instructions.
The standard pattern for 'must do' or 'have to do'. Conveys strong necessity.
明日までにこの仕事を終えなければならない。
I absolutely must finish this work by tomorrow.
A more colloquial version of なければならない. Common in spoken Japanese.
もう行かないといけない。
I absolutely have to go now.
Means 'there is a need to do'. Slightly less forceful than なければならない, but still indicates necessity.
この問題について話し合う必要がある。
We absolutely need to discuss this issue.
To state that something is a necessary condition or prerequisite for something else.
Literally 'absolute condition'. Used for non-negotiable requirements.
経験は採用の絶対条件ではない。
Experience is not an absolutely necessary condition for hiring.
A more formal phrase meaning 'essential and indispensable condition'.
信頼は良い関係の必要不可欠な条件だ。
Trust is an absolutely necessary condition for a good relationship.
To modify a verb or adjective to stress that something is absolutely necessary.
Adverb meaning 'absolutely'. Often used with 必要 or negative forms to mean 'absolutely necessary' or 'must not'.
絶対に必要なものだけ持ってきてください。
Please bring only what is absolutely necessary.
絶対に遅れないでください。
You absolutely must not be late.
Means 'by all means' or 'no matter what'. Used when something is absolutely necessary despite difficulties.
不可欠 means 'indispensable' in a general sense, while 必須 often implies a requirement or something mandatory. 必須 is common in contexts like required documents or must-have items.
パスポートは海外旅行に必須です。
A passport is absolutely necessary for overseas travel.
The English phrase 'absolutely necessary' is often overused in translation. In Japanese, the level of necessity is often conveyed through context or verb endings. Using 絶対に必要 every time can sound unnatural.
どうしても必要な書類があります。
There is a document that is absolutely necessary.