Synonym Nuance VS
How to say "Reason" in Japanese
Both words can translate to "reason", but which should you choose?
Japanese Option A
理性
りせい (risei)
N3 / CEFR Syllabus
VS
Japanese Option B
所以
ゆえん (yuen)
N1 / CEFR Syllabus
Nuance Contrast & Translation Difference
When translating "reason" into Japanese, you must choose carefully between 理性 and 所以.
In Japanese, 理性 (りせい (risei)) is typically associated with "reason; intellect; self-control; sanity; rational mind" (Syllabus Level: N3) and represents Refers to reason, intellect, self-control, sanity, or the rational mind that suppresses emotional impulses to make logical and moral decisions. Often used as 理性を失う.
On the other hand, 所以 (ゆえん (yuen)) maps to "reason; cause; origin; source; the reason why..." (Syllabus Level: N1) and represents A formal and somewhat literary term. Often used in the pattern 「〜の所以」 or 「〜する所以」 to explain the fundamental reason, origin, or essence of something, implying 'the very reason why something is as it is'.. A literal translation of "reason" can often sound unnatural to native Japanese speakers if mixed up!
Bilingual Context for "理性"
激しい怒りを感じたとしても、感情のままに行動せず、_______を保って冷静に対処することが求められます。
Even if one feels intense anger, they are required to maintain reason and handle it calmly without acting on emotion.
Bilingual Context for "所以"
彼が成功した所以は、たゆまぬ努力にあった。
The reason he succeeded was his tireless effort.
Nuance Mastery Quiz
Which Japanese word perfectly fits this blank space?
Fill in the blank: "激しい怒りを感じたとしても、感情のままに行動せず、_______を保って冷静に対処することが求められます。" (Meaning: "Even if one feels intense anger, they are required to maintain reason and handle it calmly without acting on emotion.")
🎉 Correct Answer!
Remember: "理性" fits here because it means "reason; intellect; self-control; sanity; rational mind" in the context of: "Even if one feels intense anger, they are required to maintain reason and handle it calmly without acting on emotion.". "所以" represents "reason; cause; origin; source; the reason why...".