Onyomi and Kunyomi: Because What You Kanji Isn’t What You Get

Imagine this: You learned a brand new kanji character.

Then you come across another weird word with that kanji which is read a completely different way—the kanji makes a totally different sound.

Well, in some cases, a kanji can have more than seven readings.

This may seem overwhelming at first, but there’s a method to the madness.

Once you understand where all of this originated, you’ll understand more about how kanji readings work.


The History Behind Japanese Kanji and Their Readings

For a long time, Japan didn’t have a written language of its own.

Rather, kanji is believed to have made its way to Japan from China sometime between the fifth and eighth centuries AD. At least, that’s what the evidence suggests—we know that there were groups forming in Japan to study the Chinese language at about this time in history. (And, on another note, the katakana and hiragana writing systems arose in the ninth century AD.)

As you can imagine, any time a language translates from one culture to another, things get changed around. Because of word adoptions, trades and just your regular garden variety interpretations, Japanese created a language made up of many parts.

Remember, while Japanese didn’t have a written language, it did, of course, have a spoken language prior to the arrival of Chinese characters, and the attempts to merge the two helped to create these natural variations in kanji readings.

The Two Types of Kanji Readings: Onyomi and Kunyomi

This leaves Japanese learners in the curious situation where we have to adapt to the fact that there are two types of kanji readings: Onyomi and kunyomi.

Onyomi translates roughly to “sound reading.” It means that the kanji is read the same way that it would in the Chinese language—or at least is read as a close approximation of the sounds that are found in the Chinese language, sometimes with their own unique, Japanese spin. Those who already know Chinese will notice that the readings aren’t necessarily a perfect match, due to that spin.

Kunyomi is what’s known as the fully Japanese version of the kanji reading. It’s the way that the Japanese culture managed to merge the kanji with the existing spoken language they had prior to the written one. In this circumstance, the Chinese meaning of the original character is kept, but the closest equivalent to the word in Japan’s spoken language is associated with it. As you can imagine, these words weren’t always a one-to-one match, and the Japanese language added its own connotations as needed. Hiragana was later added to kanji, tweaking readings and bringing more meaning to each kanji they’re associated with.

When Should You Use Onyomi?

That explains the two types of readings, but what about the rest?

Well, they all came from the onyomi side of the picture. Changes in culture and language don’t happen overnight—they happen slowly over time as people and perceptions shift. The news words arrived over time, often coming in multiple waves. Each wave came with slight variations and different ways of saying the words. Several of those waves stuck, and as people adapted to the multiple variations, and they all became cannon. This lead to a language with multiple pronunciations of the same word.

Of course, as a modern Japanese learner, you’re now faced with a quandary.

How do you know which readings to use? When should you use each one?

First, it’s more likely that you’ll use an onyomi in certain situations. Your first clue to use onyomi is when you’re looking at a word with multiple kanji strung together in a compound word. These words usually come from the original Chinese readings. Examples include:

理解 (りかい) understanding

短期 (たんき) short term

You’ll know that you’re on the right track when you see a word with no hiragana. Those words are strong candidates for onyomi pronunciation. The next time you’re going to consider a Japanese word as a strong contender for onyomi reading is when you’re looking at a standalone kanji. Words like (いち – one) or (はち – eight). If you see a kanji on its own, then your go-to option should be one of the onyomi readings.

When Should You Use Kunyomi?

Kunyomi is a near guarantee when you’re using proper nouns. Most notably, it’s used when you’re using native Japanese proper names. Most of the common family names are pronounced using the kunyomi version of the kanji.

So, names like 木村 (きむら) and 藤井 (ふじい) will be read as kunyomi. Just take care, because there are a few notable exceptions such as 陣内 (じんない), 伊藤 (いとう) and 佐藤 (さとう), which are read in the onyomi style.

The same is true of most of the proper nouns that are the names of places. For example:

長野 (ながの) Nagano

旭川 (あさひかわ) Asahikawa

熊本 (くまもと) Kumamoto

箱根 (はこね) Hakone

These are all kunyomi readings—obviously because they’re kanji slapped onto traditionally Japanese place names. Just like with the family names, though, there are some exceptions of note. Places such as 北海道 (ほっかいどう – Hokkaido) and 東京 (とうきょ う – Tokyo) are read aloud with the onyomi.

A helpful trick is to remember that a kunyomi is almost always used when you see a single kanji that’s followed by a hiragana character that makes up part of the word. These hiragana are called okurigana. You’ll see them frequently when you’re looking at verbs or adjectives.

Think of the adjective 白い (しろい – white) for a good example, or the verb 食べる (たべる – to eat).

How to Learn Onyomi and Kunyomi Once and for All

At the end of all things, sadly, there are few hard and fast rules on this topic.

Judging when you need to use onyomi and kunyomi readings is something that must be learned through experience and frequent encounters with the real Japanese language as it’s used by natives.

Listen to Japanese music, watch Japanese commercials and news reports and just surround yourself with the language, paired with accurate subtitles if you need help with comprehension. (That’s the principle behind the FluentU language learning program, which uses authentic Japanese videos combined with interactive subtitles and a multimedia dictionary. You can just hover over any kanji in the subtitles to instantly see its definition and pronunciation.)

Whatever content you choose, the key is to learn new kanji and their proper readings in context to remember them better.

With practice, you’ll get better at choosing the right kanji readings at the right times.

It’s purely a function of experience, so the best thing you can do is take it slow and learn over time. The truth is that even many native speakers of the language aren’t always sure what to do when they’re confronted with an unfamiliar word.

Japanese speakers are very kind about these kinds of mistakes. They’re likely to help you out and correct the readings of unfamiliar words as needed.

Don’t be embarrassed to be wrong, and don’t be afraid to ask about words that you don’t know.

In time, as you get more familiar with the language, these differences will begin to become second nature.

All languages have their quirks, and in the end, that’s what makes them so unique and special.

Katie Gatto is a college professor of computer science and a journalist. She has an avid interest in Japanese language and culture, and is willing to study in any way possible. She has been studying since 2015, and wants to help other people with their language journey.

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