Have you ever crammed a vocabulary list of 1,000 words, only to forget most of them a few months later?
But it’s not your fault—it’s how the brain works.
Your brain automatically discards any information it doesn’t encounter again within about three months.
In other words, if a word doesn’t reappear soon, your brain labels it as “not important” and deletes it.
The answer is simple:
Only memorize the words you’ll actually see again.
In English, these are high-frequency, core vocabulary that appear everywhere:
in news articles, TV shows, books, emails, and conversations.
On the other hand, forcing yourself to memorize rare words that you won’t meet for months is a waste of effort—they’ll vanish from memory anyway.
So, which words deserve your attention?
These words are like “friends you’ll definitely meet again.”
Memorizing them is worth the courtesy—they’ll return, and every time they do, they’ll stick more deeply.
Crammed words disappear after exams,
but words you meet repeatedly in different contexts naturally stay in your mind.
If you won’t see a word again within three months,
you don’t need to force yourself to memorize it.
Instead, focus on core words you’ll encounter repeatedly,
and let the rest settle naturally through reading and listening.
Don’t try to memorize every single word.
Building vocabulary is not about how many words you cram but
how many words you meet again and again.
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