Quick answer
Despercebido means unnoticed. Desapercebido means unprepared or lacking, and is much rarer.
A reliable test is to identify the job of the word before translating from English.
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What each word does
despercebido
unnoticed
Use despercebido for something not noticed or not perceived.
desapercebido
unprepared or lacking
Use desapercebido for being unprovided, unprepared, or lacking something.
How to choose
- despercebido: Choose despercebido if the sentence points to something not noticed or not perceived.
- desapercebido: Choose desapercebido if the sentence points to being unprovided, unprepared, or lacking something.
Examples
O erro passou despercebido.
The mistake went unnoticed.
Ele estava desapercebido de recursos.
He was without resources.
Common trap
Most everyday contexts need despercebido.
Practice it in context
Pick one sentence from your real life and write it twice: once with despercebido, then once with desapercebido. If both versions feel possible, name the meaning shift.
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