Translation guide
This guide covers how to express that something happened without someone knowing or being aware of it. Japanese uses various adverbs, phrases, and sentence patterns to convey this idea, often depending on whether the lack of knowledge is intentional or accidental.
To say that an action or event occurred without the person realizing it at the time.
A very common and natural way to say 'without one's knowledge' or 'before one knows it'. It implies the person was unaware while something was happening.
知らないうちに雨が降り出していた。
It had started raining without my knowledge.
彼は知らないうちに名前がリストから消えていた。
His name had been removed from the list without his knowledge.
Similar to 知らないうちに, but emphasizes not noticing or realizing. Often used for gradual changes.
気づかないうちに日が暮れていた。
It had gotten dark without my noticing.
Means 'before one knows it' or 'without one's knowledge'. Often used for things that happen subtly or unexpectedly.
いつの間にか彼女は部屋を出ていた。
She had left the room without my knowledge.
Means 'secretly' or 'without someone's knowledge', often implying intentional concealment.
彼は内緒でパーティーの準備をした。
He prepared the party without her knowledge.
To indicate that something was done without asking or informing the person, often with a nuance of secrecy or behind one's back.
Literally 'silently', but used to mean 'without telling' or 'without permission'. Implies doing something without informing the person.
彼は私に黙って車を売った。
He sold the car without my knowledge.
Means 'without permission' or 'on one's own authority'. Often carries a negative nuance of doing as one pleases without regard for others.
彼は勝手に私のパソコンを使った。
He used my computer without my knowledge.
An adverb meaning 'secretly' or 'stealthily', emphasizing the act of doing something without being noticed.
A more formal or literary way to express that something happened without someone's knowledge, often used in writing.
A slightly more formal/literary version of 知らないうちに. Often used in written language.
知らぬ間に事態は悪化していた。
The situation had worsened without anyone's knowledge.
Means 'secretly' or 'without others knowing'. Often used in literary contexts.
彼は人知れず努力を続けた。
He continued his efforts without anyone's knowledge.
Both mean 'without one's knowledge', but 知らないうちに focuses on lack of knowledge, while 気づかないうちに emphasizes lack of noticing. They are often interchangeable, but 気づかないうちに is better for gradual changes.
知らないうちに財布がなくなっていた。
My wallet was gone without my knowledge.
気づかないうちに春になっていた。
Spring had come without my noticing.
Do not directly translate 'without one's knowledge' as 知識なしで or 知らずに. These can sound unnatural or have different nuances. Use the phrases listed above instead.
彼女はこっそり部屋を抜け出した。
She slipped out of the room without anyone's knowledge.