Quadruple VS
Synonym Boundary: "理性", "所以", "国家理性", "理"
All represent the core concept "reason", but require precise selection.
Japanese Option A
理性
りせい (risei)
N3 / CEFR
Japanese Option B
所以
ゆえん (yuen)
N1 / CEFR
Japanese Option C
国家理性
こっかりせい (kokkarisei)
C2 / CEFR
Japanese Option D
理
ことわり
C2PLUS / CEFR
Quadruple VS Nuance Contrast & Social Differences
When expressing "reason" in Japanese, you must carefully distinguish between "理性", "所以", "国家理性", "理" based on context.
- 理性 (りせい (risei) - Level: N3): Maps to "reason; intellect; self-control; sanity; rational mind" and is used when 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.
- 所以 (ゆえん (yuen) - Level: N1): Maps to "reason; cause; origin; source; the reason why..." and is used when 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'..
- 国家理性 (こっかりせい (kokkarisei) - Level: C2): Maps to "reason of state / raison d'état" and is used when Essential structural term in CEFR C2 vocabulary syllabus..
- 理 (ことわり - Level: C2PLUS): Maps to "reason; principle; logic; truth (classical usage)" and is used when Essential structural term in CEFR C2PLUS vocabulary syllabus..
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.
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.
Context for "国家理性"
私は国家理性に興味があります。
I am interested in reason of state / raison d'état.
Context for "理"
私は理に興味があります。
I am interested in reason; principle; logic; truth (classical usage).
Synonym Mastery Challenge
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" is correct here because it represents "reason; intellect; self-control; sanity; rational mind" in the context: "Even if one feels intense anger, they are required to maintain reason and handle it calmly without acting on emotion.".