Translation guide
A guide to expressing the English conditional 'unless' in Japanese, covering common patterns, formal/written usage, and natural alternatives.
Express a condition where something will happen or be true except if a specific condition is met. Equivalent to 'if not'.
Unless you hurry, you won't make it.
Unless it rains, we'll go on a picnic.
A common conditional meaning 'if not'. Often used in everyday speech. Can replace 'unless' in many contexts, though it's literally 'if you don't...'.
More literally 'if not', so it can sound slightly less formal than 〜ない限り. In casual speech, 〜なきゃ is often used.
Unless you hurry, you'll be late.
Casual conditional meaning 'if not' or 'unless'. Often implies a negative consequence if the condition isn't met. Common in spoken Japanese.
Unless we go quickly, it'll sell out.
Express 'unless' in formal writing, speeches, or official documents.
Also used in formal contexts. The go-to pattern for both spoken and written formal Japanese.
Unless you have permission, entry is prohibited.
A formal pattern meaning 'unless' or 'without doing'. Often used when the condition is essential for a result. Common in written Japanese.
A very formal/literary pattern meaning 'without' or 'unless'. Often used in speeches or essays.
Emphasize that something will happen only under a specific condition, or not happen unless that condition is met.
Means 'not until' or 'only after'. Used to say that something becomes possible or happens only after a condition is fulfilled. Often translates to 'unless' in negative contexts.
Unless you get sick, you don't appreciate your health.
〜ない限り is the most direct equivalent of 'unless' and works in both formal and informal settings. 〜なければ is a general conditional 'if not' and is slightly more casual. 〜ないと is very casual and often implies a warning or negative outcome. Choose based on formality and nuance.
Unless you hurry, you won't make it. (neutral/formal)
If you don't hurry, you won't make it. (casual/neutral)
You gotta hurry or you won't make it. (casual)
Japanese does not have a single word that directly corresponds to 'unless'. Instead, use conditional patterns like 〜ない限り or 〜なければ. Translating word-for-word will result in unnatural Japanese.
Unless you study, you won't pass the exam.
I won't go unless you come with me.
Unless I see it in person, I can't judge.
Unless you make an effort, success is impossible.