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.
I made a mistake due to inattention.
He is a careless person.
An adverb/verb expressing doing something inadvertently or absent-mindedly. Often used for minor slip-ups.
I carelessly forgot the appointment.
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.
He was staring out the window absent-mindedly.
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.
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.
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.
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.
I overlooked his mistake.
勉強を疎かにしてはいけない。
You must not neglect your studies.