Translation guide
Expressing that an action is done without thinking, carelessly, or without consideration for consequences or others' feelings.
Describing an action done automatically, without conscious thought, often leading to a mistake or unintended result.
Acting in a way that disregards other people's feelings or the consequences of one's actions.
Adverb meaning 'rashly', 'thoughtlessly', or 'without due consideration'. Often used for actions that are imprudent or inconsiderate.
軽率な発言で彼女を怒らせてしまった。
I made a thoughtless remark and made her angry.
Doing something by rote or habit, without engaging the mind.
Adverb meaning 'mechanically' or 'automatically'. Used when actions are done without thought, like a machine.
機械的に作業をこなした。
I did the work thoughtlessly, like a machine.
うっかり is for accidental mistakes or forgetting (e.g., forgetting an appointment). つい is for doing something you know you shouldn't but can't resist (e.g., eating too much). Both mean 'thoughtlessly' but in different contexts.
うっかり財布を忘れた。
I carelessly forgot my wallet.
つい甘いものを食べてしまう。
I end up thoughtlessly eating sweets.
Direct translations like '思考なしに' are unnatural. Use the adverbs and phrases above depending on whether the thoughtlessness is accidental, insensitive, or habitual.
Adverb meaning 'carelessly', 'inadvertently', or 'without thinking'. Used for accidental mistakes or forgetting.
うっかり約束を忘れてしまった。
I thoughtlessly forgot about the appointment.
うっかりミスをしてしまった。
I made a careless mistake.
Adverb meaning 'unintentionally' or 'without thinking', often used when you do something you know you shouldn't.
つい食べ過ぎてしまった。
I thoughtlessly ate too much.
つい秘密を話してしまった。
I inadvertently told the secret.
Adverb meaning 'casually', 'without much thought', or 'unintentionally'. Implies doing something without deep consideration.
何気なく言った言葉が彼を傷つけた。
A thoughtless remark I made casually hurt him.
Adverb meaning 'unconsciously' or 'without awareness'. Used for actions done automatically, without conscious thought.
無意識に髪を触る癖がある。
I have a habit of thoughtlessly touching my hair.
Adverb meaning 'absentmindedly' or 'vaguely'. Used when someone is not paying attention and acts without thinking.
ぼんやりしていて電車を乗り過ごした。
I was spacing out and thoughtlessly missed my stop.
You shouldn't act thoughtlessly.
Adverb meaning 'insensitively' or 'thoughtlessly'. Emphasizes lack of consideration for others' feelings.
彼は無神経なことを言う。
He says thoughtless things.
Phrase meaning 'without thinking' or 'thoughtlessly'. Directly expresses lack of consideration.
考えなしに行動すると失敗する。
If you act thoughtlessly, you'll fail.
Formal adverb meaning 'thoughtlessly' or 'without deliberation'. Used in written or formal contexts.
思慮なく発言したことを後悔している。
I regret speaking thoughtlessly.
Phrase meaning 'by force of habit' or 'through inertia'. Implies continuing without thought.
惰性でテレビを見続けた。
I thoughtlessly kept watching TV out of habit.