die Lebenskraft
vitality
The inner energy, vitality, and resilience that is inherent in a living being and keeps it alive.
Nach der Krankheit kehrte ihre Lebenskraft nur langsam zurück.
After the illness, her vitality returned only slowly.

vitality
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vitality
The inner energy, vitality, and resilience that is inherent in a living being and keeps it alive.
Nach der Krankheit kehrte ihre Lebenskraft nur langsam zurück.
After the illness, her vitality returned only slowly.

The word is made up of 'Leben' (life) and 'Kraft' (strength/power), connected by an 's'. So it literally describes the 'Kraft des Lebens' (strength of life).
Trotz ihres hohen Alters ist sie noch voller Lebenskraft.
Despite her advanced age, she is still full of vitality.
'Lebenskraft' (vitality) is often used with verbs that describe gaining or losing something. Typical combinations are 'Lebenskraft schöpfen' (to draw new vitality), 'Lebenskraft sammeln' (to gather vitality), or 'seine Lebenskraft verlieren' (to lose one's vitality).
In der Natur konnte er neue Lebenskraft schöpfen.
In nature, he was able to draw new vitality.
The word 'Lebenskraft' (vitality) belongs more to an elevated or slightly poetic style of speech. It describes a deeper, fundamental energy, not just physical fitness.
Der Frühling weckt in allen Dingen eine neue Lebenskraft.
Spring awakens new vitality in all things.
strength / force
'die Kraft' and 'die Lebenskraft' both refer to energy and strength. 'Kraft' is the normal, general word: it can mean physical strength or emotional strength in a difficult situation. 'Lebenskraft' is more specific and sounds more like inner vitality, health, and the will to live. It is often used when someone seems lively and resilient again after illness, old age, or great strain. Learners may confuse the words because both mean energy. A simple rule is: for everyday situations, usually use 'Kraft'; for the deep inner energy of a living being, use 'Lebenskraft' rather than 'Kraft'.

Nach der Operation kam ihre Lebenskraft langsam zurück.
After the operation, her vitality slowly returned.
Vor der Prüfung sammelt sie noch einmal ihre ganze Kraft.
Before the exam, she gathers all her strength once more.