Meaning
Not every sword is a 剣. The character refers specifically to a straight, double-edged blade — quite different from 刀 (katana), the curved, single-edged weapon Japan is famous for. 剣 carries formality and weight, appearing across Japanese history in contexts that range from ancient mythology to modern martial arts.
Look at the right side of 剣 and the meaning snaps into focus: 刂 (りっとう), the blade-form of 刀 (sword/knife). This two-stroke radical marks many kanji connected to cutting and blades. The left side simplifies from the traditional 劍, whose element 僉 once meant "all together" — hinting at a weapon that demanded collective craft and devotion to produce. Modern Japanese trimmed the original 15 strokes of 劍 down to 10, but the meaning carried over unchanged.
真剣 literally means "real sword," but in daily conversation it means serious or earnest. Face an unblunted blade and half-measures vanish — that visceral image translated directly into an expression of absolute dedication. You will encounter this figurative sense far more often than the literal sword meaning.
With 10 strokes, 剣 sits on the Joyo kanji list and appears in JLPT N1 exams. It skips the elementary school curriculum entirely — high school graduates and advanced learners are expected to know it.
Readings
On'yomi (音読み) — Chinese-derived readings
ケン (ken) is 剣's Sino-Japanese reading, tracing back to ancient Chinese pronunciation. It appears almost exclusively in compound words (熟語). In practice, ケン is the reading you will encounter most — especially in martial arts vocabulary, sword terminology, and figurative expressions.
- 剣道 (kendō) — the martial art of Japanese fencing, practiced with bamboo swords and a cornerstone of Japanese physical education
- 剣術 (kenjutsu) — classical sword-fighting technique, the traditional battlefield art that preceded modern kendō
- 真剣 (shinken) — a real unblunted sword; in everyday use, "serious" or "in earnest"
Kun'yomi (訓読み) — Native Japanese readings
つるぎ (tsurugi) is the native Japanese name for the straight, double-edged sword. The word carries deep cultural and religious resonance: the 草薙の剣 (Kusanagi-no-Tsurugi) is one of Japan's three Imperial Regalia, alongside the sacred mirror and the jewel. You will find つるぎ in poetic, mythological, and formal historical writing — rarely in casual speech. Compared to ケン, it feels archaic and weighty.
- 剣 (tsurugi) — a straight double-edged sword; the ancient Japanese sacred sword
- 草薙の剣 (Kusanagi no Tsurugi) — the legendary divine sword of Japanese mythology, one of the Imperial Treasures
- 両刃の剣 (moroha no tsurugi) — a double-edged sword; used figuratively for something that can both help and harm
Common Words & Compounds
Martial arts and swordsmanship:
- 剣道 (kendō) — the Way of the Sword; Japan's traditional fencing discipline, practiced by millions today
- 剣術 (kenjutsu) — classical sword-fighting art; the combat-focused forerunner of modern kendō
- 剣士 (kenshi) — swordsman, sword fighter; a general term for someone skilled with a sword
- 剣豪 (kengō) — master swordsman; a legendary or supremely skilled sword fighter such as Miyamoto Musashi
- 剣客 (kenkaku) — a skilled swordsman who lives by or makes a living through the sword
Types of swords and blades:
- 刀剣 (tōken) — swords and blades collectively; the umbrella term used in museums and collections
- 短剣 (tanken) — dagger, short sword; a blade shorter than a standard sword
- 木剣 (bokken) — wooden practice sword used in martial arts training to safely simulate real blade techniques
- 宝剣 (hōken) — a treasured or sacred sword; used to describe revered blades held in Imperial collections or enshrined as divine artifacts
Figurative and extended uses:
- 真剣 (shinken) — serious, earnest, in earnest; the most frequently used everyday word derived from this kanji
- 剣幕 (kenmaku) — a menacing look, threatening attitude, fury; the fierce expression of someone extremely angry
- 剣山 (kenzan) — a pin holder used in Japanese flower arrangement (ikebana), shaped like a "mountain of swords"
Example Sentences
彼は剣道を十年習っています。
Kare wa kendō wo jūnen naratte imasu.
He has been practicing kendō for ten years.
真剣に考えてみてください。
Shinken ni kangaete mite kudasai.
Please try to think about it seriously.
博物館に古い刀剣が展示されていた。
Hakubutsukan ni furui tōken ga tenji sarete ita.
Old swords and blades were on display at the museum.
その剣士は試合で見事な技を見せた。
Sono kenshi wa shiai de migoto na waza wo miseta.
That swordsman showed brilliant technique in the match.
草薙の剣は日本の三種の神器の一つです。
Kusanagi no Tsurugi wa Nihon no Sanshu no Jingi no hitotsu desu.
The Kusanagi sword is one of the three Imperial Regalia of Japan.
彼女は短剣を腰に差していた。
Kanojo wa tanken wo koshi ni sashite ita.
She had a dagger at her waist.
その政策は両刃の剣になりかねない。
Sono seisaku wa moroha no tsurugi ni nari kanenai.
That policy could easily become a double-edged sword.
剣豪宮本武蔵は江戸時代を代表する剣士だ。
Kengō Miyamoto Musashi wa Edo-jidai wo daihyō suru kenshi da.
Miyamoto Musashi stands as the defining swordsman of the Edo period.
部長はすごい剣幕で会議室に入ってきた。
Buchō wa sugoi kenmaku de kaigishitsu ni haitte kita.
The manager entered the conference room with a terrifying look on his face.
Memory Tip
Start with the right side: 刂 (りっとう), the knife radical. Two strokes, unmistakable. Spot it on the right of any kanji and think "blade." Now picture a warrior on the left, gripping that blade with both hands — not casual, not distracted, but completely serious. That image bridges both meanings of the character: the literal 剣 (sword) and the figurative 真剣 (seriousness). "Pick up the 剣 and everything becomes 真剣." Once that image clicks, both meanings stay.