Translation guide
The English word "logic" covers a range of meanings from formal reasoning to common sense. This guide helps you choose the right Japanese expression depending on whether you mean the academic discipline, a way of thinking, or the rationale behind something.
Referring to logic as a field of study, formal logic, or logical systems.
The standard term for the academic study of logic. Used in philosophy, mathematics, and computer science.
He is majoring in logic at university.
Can mean 'logic' in a broad sense, often used in compounds like 論理的 (logical). Less specific than 論理学 when referring to the discipline.
This program is based on logic.
Describing a particular method of reasoning or a logical thought process.
The most common word for 'logic' as a way of thinking. Used in phrases like 論理的な考え方 (logical way of thinking).
I can't understand his logic.
Please think more logically.
Often implies theoretical or abstract reasoning, sometimes with a negative nuance of being overly argumentative or hair-splitting.
Refers to reason or the natural order of things. Often used in set phrases like 道理で (no wonder).
Explaining the underlying reason or justification for an action, decision, or phenomenon.
The most straightforward word for 'reason' or 'rationale'. Use this when 'logic' simply means the reason why.
Please explain the logic behind that decision.
Means 'basis' or 'grounds'. Used when emphasizing the foundation or evidence for a claim.
Means 'reason' or 'coherence' in a more abstract sense. Often used in phrases like 筋が通っている (it makes sense).
Using 'logic' to mean something that is obviously sensible or reasonable in everyday situations.
論理 is neutral and often positive, referring to sound reasoning. 理屈 can imply overly theoretical or argumentative logic, sometimes used dismissively (e.g., 理屈っぽい meaning 'argumentative').
The loanword ロジック exists but is mainly used in technical or business contexts (e.g., ロジックモデル). In everyday speech, it can sound unnatural or like jargon.
There's no logic in that argument.
I don't follow your logic.
What's the logic behind this rule?
理屈ではわかっているけど、感情がついていかない。
I understand the logic, but my emotions can't keep up.
彼の言うことには道理がある。
There is logic in what he says.
There is no logical basis for that claim.
His story has logic to it.
That's just basic logic.