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Il est conscient de ses erreurs.
He is aware of his mistakes.
aware or conscious of something
Elle est consciente du danger.
She is aware of the danger.
Ils sont conscients de l'urgence.
They are conscious of the urgency.
conscientious or diligent
C'est un employé sérieux et conscient.
He is a serious and conscientious employee.
From Latin conscius, knowing together.