知己

• Pinyin: zhī jǐ
• Hanzi breakdown: 知 = 矢 + 口 (arrow + mouth — knowledge that hits the mark); 己 = oneself

Meaning

A bosom friend; an intimate confidant who truly understands you. Also used as an adjective meaning deeply understanding.

A classical literary term expressing the deepest friendship. 知己知彼 (know yourself and know your enemy) is a famous phrase from Sun Tzu. 红颜知己 refers to a close female confidant. Implies rare, profound mutual understanding.

Examples

1. 人生得一知己足矣，斯世当以同怀视之。 To have one true confidant in life is enough; in this world, you should treat them as someone who shares your heart.
2. 他们相识多年，早已成为彼此的知己好友。 They’ve known each other for years and have long since become close, kindred friends.
3. 在茫茫人海中遇到一个真正的知己并不容易。 In the vast sea of people, it’s not easy to meet a true confidant.

Usage Guide

Context: friendship, literature, personal

Tone: warm

Do Say

• 他是我多年的知己，无话不谈，彼此信任。(He has been my bosom friend for many years — we talk about everything and trust each other.)
• 人生难得有知己，要好好珍惜这份情谊。(It is rare in life to have a true confidant — one must cherish this friendship.)

Don't Say

• 我有很多知己 — 知己 implies rare, deep connection; having many would dilute the meaning; use 好朋友 for multiple close friends

Origin & History

知 (know/understand) + 己 (oneself) — one who knows you as you know yourself

Cultural Context

Generation: All ages

Social background: Universal