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Mentally awake, attentive, and quick to react. Describes a person who perceives their surroundings clearly and can respond quickly to changes.
Trotz ihres hohen Alters ist sie noch sehr alert und an allem interessiert.
Despite her advanced age, she is still very alert and interested in everything.
The adjective 'alert' (alert) is very often used predicatively, meaning it comes after a verb such as 'sein' (to be), 'wirken' (to seem), or 'bleiben' (to remain). In this position, it is not declined.
Der Patient war nach der Operation schnell wieder alert.
The patient was quickly alert again after the operation.
This word is often used to describe a person's mental state, especially in the context of health and age. A typical positive description for older people is that they are still very alert.
Mein Großvater ist 90 Jahre alt, aber geistig noch total alert.
My grandfather is 90 years old, but mentally he is still totally alert.
'Alert' (alert) is a loanword from French and often sounds somewhat more educated or technical. It is especially common in medical or psychological contexts.
Die Krankenschwester prüfte, ob der Patient alert und ansprechbar war.
The nurse checked whether the patient was alert and responsive.
attentive / considerate
'aufmerksam' and 'alert' both mean that someone is mentally awake and notices things well. 'aufmerksam' is the normal German word when someone is listening, paying attention, or concentrating. 'alert' emphasizes more strongly that someone can react quickly and is observing their surroundings closely. It often sounds more technical or more specialized than 'aufmerksam'. Learners may confuse the words because both have to do with being mentally awake. In everyday life, 'aufmerksam' is usually more natural; 'alert' fits better when the ability to react is important, for example in danger, monitoring, or demanding work.
Nach der Nachtschicht bleibt der Fahrer alert, weil die Straße glatt ist.
After the night shift, the driver stays alert because the road is icy.
Beim Einkaufen war Lisa aufmerksam und hat den Fehler auf dem Kassenbon sofort gesehen.
While shopping, Lisa was attentive and noticed the mistake on the receipt right away.