Usage Note
inaperçu is typically used in the fixed phrase passer inaperçu (to go unnoticed). It agrees in gender and number with what goes unnoticed: elle est passée inaperçue, une erreur inaperçue. The word is formal and rarely used outside this near-fixed construction.
Examples
"Il est passé inaperçu dans la foule."
Natural Translation
He went unnoticed in the crowd.

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