Translation guide
How to express that something happens suddenly, without prior notice, in Japanese.
Describing an action or event that occurs abruptly, without any prior indication.
The most common and neutral way to say 'suddenly' or 'without warning'. Can be used in both spoken and written Japanese.
Emphasizing that there was no visible clue or hint before something happened.
A stronger version of 前触れもなく, adding 'any' for emphasis. Common in both speech and writing.
何の前触れもなく彼は姿を消した。
He disappeared without any warning whatsoever.
Expressing that something completely unexpected happened, often with a nuance of surprise or shock.
突然 (totsuzen) is the most neutral and can be used in any situation. いきなり (ikinari) is more colloquial and often implies a lack of proper order or expectation, sometimes with a negative nuance. 急に (kyuu ni) is also common and often used for changes in state or weather. いきなり can sound more abrupt and surprising than 突然.
The English phrase 'without warning' is often translated as 警告なしに (keikoku nashi ni), but this is not natural in most contexts. 警告 means 'warning' in the sense of a caution or alert, not a prior notice. Use 前触れもなく or 予告なしに instead.
彼は突然部屋を出て行った。
He left the room without warning.
突然の雨で試合が中止になった。
The game was canceled due to a sudden rain.
Very common in casual speech. Emphasizes the abruptness and often implies a lack of proper procedure or expectation.
いきなり大声で怒鳴られてびっくりした。
I was startled when he suddenly yelled at me without warning.
彼はいきなり会社を辞めた。
He quit his job without any warning.
Means 'suddenly' or 'abruptly', often used for changes in state or unexpected actions. Slightly less forceful than 突然.
急に雨が降り出した。
It started raining without warning.
彼は急に態度を変えた。
He suddenly changed his attitude.
Literally 'without any omen/notice'. A more descriptive phrase that directly corresponds to 'without warning'. Suitable for both spoken and written contexts.
地震が前触れもなく発生した。
The earthquake struck without warning.
彼は前触れもなく訪ねてきた。
He visited without any prior notice.
Means 'without advance notice'. Often used in formal or official contexts, such as inspections, announcements, or changes in policy.
予告なしに停電が行われた。
A power outage was carried out without warning.
Literally 'without even a sign/symptom'. Often used for medical or natural phenomena, but can be used generally.
病気は兆候もなく進行していた。
The disease progressed without any warning signs.
An idiomatic expression meaning 'a bolt from the blue'. Used for shocking, completely unexpected events. Somewhat literary.
そのニュースは青天の霹靂だった。
The news came like a bolt from the blue.
An idiom meaning 'out of the blue' or 'suddenly and unexpectedly', often used when someone says or does something abrupt and surprising.
藪から棒にそんなことを言われても困る。
I don't know what to do when you say something like that out of the blue.