Translation guide
The English word "intellect" refers to the faculty of reasoning, understanding, and thinking abstractly. In Japanese, this concept is expressed through several words that emphasize different aspects: general intellectual ability, sharpness of mind, or the capacity for deep thought. The most common and versatile term is 知性 (chisei), which covers the broad sense of intellect as a human faculty. Other words like 知力 (chiryoku) and 理知 (richi) are more formal or literary. When describing a person, phrases like 頭がいい (atama ga ii) are more natural than direct translations.
intellect (general faculty)
sharp intellect (person)
Use this phrase to describe a person.
The general ability to think, reason, and understand, often as a human trait.
The most common and neutral word for 'intellect' as a human faculty. It implies intelligence combined with depth and refinement.
She is full of intellect.
His way of speaking conveys intellect.
Refers to intellectual power or mental capacity, often in contexts of problem-solving or academic ability. Slightly more formal than 知性.
A literary term for intellect, emphasizing reason and rationality. Rare in everyday speech.
The quality of being quick-witted, intelligent, or mentally sharp, often in a practical sense.
The most natural way to describe someone as intelligent or having a good intellect. Literally 'head is good', it's used for both academic and practical smarts.
He has a sharp intellect.
People with intellect understand quickly.
Refers to intelligence or mental ability, often measurable (like IQ). More clinical than 知性.
Describes a person who is wise and intelligent, often with good judgment. Formal and complimentary.
The quality of being intellectually developed, cultured, or engaged in deep thought.
Also used for the cultivated aspect of intellect, implying refinement and education.
His intellect comes from wide reading.
Refers to cultural and intellectual refinement, education, and cultivation. Often overlaps with 'intellect' in the sense of being well-read and cultured.
Saying 彼は知性がある (kare wa chisei ga aru) is grammatically correct but sounds stiff. In casual conversation, 頭がいい (atama ga ii) or 賢い (kashikoi) is much more natural.
He's got a good intellect, hasn't he?
知性 (chisei) is the broadest and most common, implying depth and refinement. 知能 (chinou) is more clinical, often used for measurable intelligence. 理知 (richi) is literary and emphasizes reason.
この問題は知力を試される。
This problem tests your intellect.
He is a man of intellect.
知能指数が高い。
He has a high intellect (IQ).
聡明な指導者
a leader of great intellect
教養のある人
a person of intellect and culture