Meaning
易 has two core meanings: easy/simple, and change/exchange. At the everyday level, it describes tasks requiring little effort — the direct opposite of 難 (difficult). This shows up in the adjective やさしい (easy) and the common suffix -やすい, which attaches to verb stems to mean "easy to [verb]."
The second meaning — change — is far older. It comes from the 易経 (えききょう, Ekikyō), the ancient Chinese I Ching or Book of Changes. In that tradition, 易 represents constant transformation: nothing stays fixed. The character also took on the sense of divination, since the I Ching was used to read the direction of those changes.
The character's origin is debated. One theory holds it was originally a pictograph of a chameleon — a creature that changes color without effort. Another suggests the upper 日 component shows sunlight streaming down, bringing clarity and ease. Either way, the link is intuitive: in Taoist thought, natural change needs no force. Things simply shift.
易 is a Grade 5 kanji, taught to children around age 10–11 in Japan. It has 8 strokes and belongs to the 日 (sun/day) radical group.
Readings
On'yomi (音読み) — Chinese-derived readings
易 has two on'yomi readings, each tied to a different meaning. Knowing which applies to a given compound is essential at N3 level.
エキ (eki) — Used in compounds related to divination, the I Ching, and trade/exchange.
- 易者 (ekisha) — fortune-teller
- 易経 (ekikyō) — the I Ching
- 貿易 (bōeki) — international trade
イ (i) — Appears in formal compounds meaning ease or simplicity, common in academic and business writing.
- 容易 (yōi) — easy, simple
- 安易 (an'i) — taking the easy way out; slightly negative tone
- 平易 (heii) — plain and clear; used to praise accessible writing or speech
Kun'yomi (訓読み) — Native Japanese readings
やさ.しい (yasashii) — An i-adjective meaning easy or simple. Watch out: やさしい is a homophone shared by two kanji. 易しい = easy in difficulty; 優しい = kind in character. Context and kanji are the only way to tell them apart.
- 易しい問題 (yasashii mondai) — an easy question
- 易しい言葉 (yasashii kotoba) — simple words, plain language
やす.い (-yasui) — A suffix attached to the verb stem (masu-stem) meaning "easy to [verb]" or "prone to [verb-ing]." One of the most common compound adjective patterns in modern Japanese.
- 壊れ易い (koware-yasui) — fragile, easy to break
- 分かり易い (wakari-yasui) — easy to understand
- 忘れ易い (wasure-yasui) — easy to forget
Common Words & Compounds
Ease and Simplicity
- 容易 (yōi) — easy, simple; formal register, common in written and business Japanese
- 平易 (heii) — plain and clear; describes writing or explanations that are easy to follow
- 安易 (an'i) — overly simplistic, cutting corners; mild negative nuance
- 難易度 (nan'ido) — level of difficulty; widely used in education and testing contexts
- 難易 (nan'i) — degree of difficulty; the abstract concept of hard versus easy
Trade and Exchange
- 貿易 (bōeki) — international trade; core business vocabulary
- 貿易会社 (bōeki gaisha) — trading company, import-export business
- 貿易摩擦 (bōeki masatsu) — trade friction, dispute between nations
Divination and Change
- 易者 (ekisha) — fortune-teller, divination practitioner
- 易経 (ekikyō) — the I Ching, classical Chinese Book of Changes
- 変易 (hen'eki) — change, transformation; formal, literary term
Suffix Compounds with -やすい
- 読み易い (yomi-yasui) — easy to read; said of clear handwriting or well-written text
- 使い易い (tsukai-yasui) — easy to use, user-friendly
- 聞き易い (kiki-yasui) — easy to listen to; describes clear speech or pleasant audio
Example Sentences
この本は易しい言葉で書かれています。
Kono hon wa yasashii kotoba de kakarete imasu.
This book is written in simple, easy-to-understand words.
今日のテストは易しかったので、みんな早く終わりました。
Kyō no tesuto wa yasashikatta node, minna hayaku owarimashita.
Today's test was easy, so everyone finished quickly.
日本と中国の貿易は年々拡大しています。
Nihon to Chūgoku no bōeki wa nennen kakudai shite imasu.
Trade between Japan and China keeps expanding year by year.
この説明は分かり易くて、とても助かりました。
Kono setsumei wa wakari-yasukute, totemo tasukarimashita.
This explanation was so easy to follow — it really helped me.
その問題は容易に解けるものではありません。
Sono mondai wa yōi ni tokeru mono de wa arimasen.
That problem is not something that can be easily solved.
このスマートフォンは使い易くて初心者にも向いています。
Kono sumātofon wa tsukai-yasukute shoshinsha ni mo muite imasu.
This smartphone is easy to use and works well even for beginners.
安易な答えを出すのではなく、深く考えてください。
An'i na kotae wo dasu no de wa naku, fukaku kangaete kudasai.
Don't settle for a shallow answer — think it through more carefully.
貿易摩擦が両国の外交関係に影響を与えています。
Bōeki masatsu ga ryōkoku no gaikō kankei ni eikyō wo ataete imasu.
Trade friction is straining diplomatic ties between the two countries.
試験の難易度を事前に調べてから勉強の計画を立てましょう。
Shiken no nan'ido wo jizen ni shirabete kara benkyō no keikaku wo tatemashō.
Check the exam's difficulty level first, then build your study plan around it.
易者に占ってもらったが、信じるかどうかは自分で決めることだ。
Ekisha ni uranatte moratta ga, shinjiru ka dō ka wa jibun de kimeru koto da.
I had a fortune-teller read my future, but whether to believe it is up to me.
Memory Tip
Picture the sun (日) sitting at the top of the character, rays streaming down. Bright light makes tasks easy — paths become clear, shadows vanish. Now add a chameleon basking in that warmth, effortlessly changing color as the light shifts. No struggle, no resistance. Just flow.
Two images, two meanings: ease (やさしい, やすい) and change (エキ). When you meet 易 in a new word, ask yourself: is this about being easy — イ reading, like 容易 — or about exchange and transformation — エキ reading, like 貿易?