Forgetting Chinese Words You Learned? That's Normal

Yes, it is normal to forget Chinese words you learned weeks or months ago, including words you reviewed correctly several times. Forgetting is the default behaviour of memory, and a spaced repetition system schedules its reviews around it. The workable goal is to forget at a rate you can afford and to catch the words that slip before they are gone.

That is true for any language, but Chinese has two features that make it feel worse: thousands of characters that look alike, and a reading that has to be remembered separately from the meaning. If you studied with Anki for six months and feel you retain “nothing”, the cause is usually one of a small number of fixable things, covered below.

What the forgetting curve says

In the 1880s Hermann Ebbinghaus ran memory experiments on himself and published them in 1885 as Über das Gedächtnis. His central observation has been repeated many times since: newly learned material fades fastest soon after learning, and relearning takes less effort each time, especially when the repetitions are spread over several days. That is the reasoning behind review intervals that grow from a day to several days to weeks.

Two consequences matter for a Chinese learner:

• A word you have seen once or twice is fragile. Forgetting it within a couple of weeks is expected for almost everyone.
• A word you have recalled correctly several times, over longer gaps, becomes sturdier. Not permanent, but sturdier. A review a few months later is often enough to keep it.

A scheduler such as FSRS tries to place each review at the point where your chance of recall has dropped to a chosen target, often 90 percent. The detail is in the FSRS algorithm explainer.

What normal forgetting looks like

If your target retention is 90 percent (with FSRS), then by design about one review in ten fails when the card comes due. That is the system working. Failing one in ten is a healthy result and failing one in two is not. Roughly, here is how to read your own numbers:

What you see	Reading
About 1 in 10 reviews answered “Again”	Normal at a 90 percent target
Some words you cannot recall after months with no review	Normal; they had not been reviewed
A handful of cards you fail again and again	Leeches; see below
Most cards failing, across many words	A load or card design problem
You recognise a word but cannot recall the meaning at once	Partial memory; this is recoverable

At six months of steady study, expect that most of the words you have reviewed regularly are still available, a minority are shaky, and a few are persistent problems. If almost everything is gone, look at how you studied before blaming yourself. The usual causes are a long unscheduled gap, adding words far faster than you could review them, or cards that tested only one thing (see the card design section).

Leeches: the few cards that cost the most

Anki calls a card that you keep failing a leech. By default it marks a card as a leech after eight lapses. A few leeches are normal in a large deck. They consume attention because you see them often and keep getting them wrong.

Do not simply press “Again” a ninth time. Change something about the card.

• Add a sentence. A word with no context is hard to hold. A short example gives your memory another hook.
• Add the component story. Split the character into the parts you can name, then tie the meaning to them.
• Split the card. If a card tests meaning and reading and writing at once, test one thing at a time.
• Suspend it for a month. Often a word becomes easier after you meet it in real reading.
• Delete it if it is useless to you now. Every word on a list does not deserve your time.

Look-alike characters: interference

Some of what feels like Chinese forgetting is confusion between similar items. Two similar items compete in memory, and you retrieve the wrong one. Learning psychologists call this interference. Traditional characters produce plenty of it, because many pairs differ by a single stroke or one component. A few well-known examples:

Pair	Readings	What differs
未 / 末	wèi / mò	未 has the shorter stroke on top; 末 has the longer
己 / 已 / 巳	jǐ / yǐ / sì	how far the last stroke reaches up toward the top
買 / 賣	mǎi / mài	賣 adds 士 on top
日 / 曰	rì / yuē	曰 is wider and flatter; 日 is narrow
人 / 入	rén / rù	in 入 the right-hand stroke starts higher; in 人 the left

If you are forgetting these, no schedule will help until the confusion is addressed directly. Put the pair on the same card, or on cards close to each other, so that you meet the difference rather than each item alone. Learn each with a common word attached: 未來 (wèilái, “future”) and 週末 (zhōumò, “weekend”); 自己 (zìjǐ, “oneself”) and 已經 (yǐjīng, “already”); 買 and 賣 with a short sentence that uses both. We cover more sets in Similar-Looking Chinese Characters: How to Tell Them Apart.

Why Chinese asks for more than one kind of memory

A Chinese word has at least three parts: how it sounds (with a tone), what it means, and how it is written. Remembering one does not guarantee the others. Many learners can recognise 買 on sight and still be unable to say it with the right tone or write it unprompted. That is a gap in how the memories were built, because sound, meaning and writing were never tied together in the first place.

If your cards show only the character and ask for the meaning, you are building recognition and nothing else. When you later need to say or write the word, it can feel as if you have forgotten it. You may never have practised it in that direction. More on this trade-off is in Does Spaced Repetition Work for Chinese?.

What to do this week

1. Sort your failures. Look at the last 50 cards you failed. Are they the same few look-alikes, or scattered across many words?
2. Treat leeches individually. Fix or remove them rather than repeating them.
3. Check the load. If you add more new words than your reviews can absorb, the system forgets for you. Lower the number of new words.
4. Add context to the weak words. A phrase or sentence from a graded text beats a bare definition.
5. Wait before you judge. A word you forgot can be recovered. Seen again, it usually returns faster than it came the first time.

None of this needs a bigger memory or a harder study schedule. It needs cards and a pace that fit how memory behaves.

Related reading

• FSRS for Chinese: Best Anki Settings for Fewer Reviews
• Does Spaced Repetition Work for Chinese?
• Similar-Looking Chinese Characters: How to Tell Them Apart
• Restarting Chinese After a Long Break