Zorg SpaceWhy do I forget new vocabulary so quickly?
Short answer
Because forgetting is what memory does by default — especially in the first hours and days after you meet something new. In the 1880s, the psychologist Hermann Ebbinghaus measured his own memory for lists of syllables and found that most of what he forgot, he forgot soon after learning; the “forgetting curve” drops steeply at first and then levels off. A word you saw once yesterday, without using it, is likely to be gone by next week.
What slows the curve is reviewing at increasing intervals and actively recalling the word rather than re-reading it. Words also stick better when they mean something to you, when you use them, and when you meet them again in real reading and listening.
The forgetting curve
The exact shape depends on the material and the person, but the pattern is consistent: a steep early drop, then a slower decline. Each successful review flattens the curve, so the next review can come later. That is the logic of spaced repetition: review just as forgetting begins, then wait longer each time.
A reassuring detail from Ebbinghaus’s work: relearning something you have “forgotten” takes less time than learning it the first time. Forgotten words are not wasted — they come back faster.
Why some words stick and others don’t
- Meaning and relevance. Words you need — for your job, your hobbies, your life — are easier to remember than random list words.
- Emotion and vividness. A word met in a funny, embarrassing or memorable situation sticks.
- Frequency of encounter. Words you meet often in reading and listening get reviewed “for free”.
- Distinctiveness. Words that look and sound like many others are easily confused.
- Interference. Similar words compete: Spanish embarazada (pregnant) is easily confused with English embarrassed, and two new words learned on the same day that look alike can blur into each other.
- Learning burden. Some words carry more to learn: irregular forms, unusual spelling, several meanings.
How many encounters does a word need?
There is no single number. Studies of learning words from reading suggest that it often takes many encounters — commonly ten or more for a word to become solid, depending on the word and on how much attention it gets each time. Deliberate review (flashcards) makes each encounter count more; meeting words in context adds the depth.
What actually helps
- Recall, don’t re-read. Testing yourself strengthens memory more than reading the word again (Roediger and Karpicke, 2006).
- Space your reviews. Spreading practice over time is consistently more effective than massing it, across hundreds of studies (Cepeda and colleagues, 2006).
- Learn words in context. A sentence or phrase gives the word meaning and partners.
- Use the word. Write it, say it, use it in a message. Production deepens memory.
- Add sound and images. Hearing a word and seeing a clear picture gives memory more routes back to it.
- Separate similar words. Don’t learn saber and conocer on the same day as unconnected words; learn them as a contrast instead.
When words keep slipping
Most learners have a few “leeches” — words they fail again and again. For those:
- Look at why: similar to another word? Unclear meaning? Bad card?
- Rewrite the card with a vivid example sentence or a picture.
- Learn the confusing pair together as a contrast.
- If a word is rare and not useful to you, delete it. Not every word deserves a place.
In short
- Fast forgetting is normal, especially in the first days.
- Spaced, active recall flattens the forgetting curve.
- Meaning, use, context, sound and images make words stick.
- Treat repeatedly forgotten words as a signal to change the card, not to try harder.
Sources
Practise it in Zorg Space
Reading an answer is the first step. In the app, the same grammar becomes exercises with instant correction, new words come back for review just before you would forget them, and you listen and speak as well.
Practise in Zorg Space