Translation guide
The state or act of not paying attention, being distracted, or failing to notice something. Japanese expresses this through nouns, verbs, and adjectives that describe carelessness, absent-mindedness, or neglect.
Describing a lack of attention or care, often leading to mistakes.
The most common and neutral word for inattention or carelessness. Can be used as a noun or na-adjective.
不注意でミスをした。
I made a mistake due to inattention.
彼は不注意な人だ。
He is a careless person.
An adverb/verb expressing doing something inadvertently or absent-mindedly. Often used for minor slip-ups.
うっかり約束を忘れてしまった。
I carelessly forgot the appointment.
うっかりして電車を乗り過ごした。
I wasn't paying attention and missed my train stop.
Describes a state of being spaced out, absent-minded, or daydreaming. Often used as an adverb or to-become verb.
彼は窓の外をぼんやり眺めていた。
He was staring out the window absent-mindedly.
ぼんやりしていて信号を見落とした。
I was spacing out and missed the traffic light.
Literally 'sky above', meaning one's mind is elsewhere, not paying attention to the present. Often used in set phrases.
彼は上の空で話を聞いていなかった。
He was inattentive and not listening to the conversation.
Failing to pay proper attention to something important, often with negative consequences.
Negligence or neglect, often in a duty or responsibility. Stronger than 不注意.
その事故は運転手の怠慢が原因だった。
The accident was caused by the driver's negligence.
An oversight; failing to notice something. The verb form is 見落とす.
Neglecting or being inattentive to something one should do. Often used as 〜を疎かにする.
A brief moment of inattention, often leading to an accident or mistake.
A momentary lapse of attention. Commonly used in warnings or accident descriptions.
一瞬の不注意が大事故につながる。
A moment's inattention can lead to a serious accident.
To let one's guard down, become inattentive due to relaxation or complacency.
慣れた作業で気が緩んでしまった。
I became inattentive because it was a familiar task.
不注意 is a general noun/adjective for carelessness. うっかり is an adverb for absent-minded mistakes. ぼんやり describes a mental state of being spaced out. Use 不注意 for formal contexts, うっかり for personal slip-ups, and ぼんやり for dreamy inattention.
English 'inattention' is often translated as 不注意, but in casual speech, Japanese speakers more naturally use うっかり or ぼんやり depending on the nuance. Using 不注意 in every case can sound stiff.
報告書に重大な見落としがあった。
There was a serious oversight in the report.
彼のミスを見落としてしまった。
I overlooked his mistake.
勉強を疎かにしてはいけない。
You must not neglect your studies.