menschlich
human
Related to humans, originating from humans, or characteristic of them.
Fehler zu machen ist zutiefst menschlich.
Making mistakes is deeply human.

human
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human
Related to humans, originating from humans, or characteristic of them.
Fehler zu machen ist zutiefst menschlich.
Making mistakes is deeply human.

The adjective 'menschlich' (human) is derived directly from the noun 'der Mensch' (human being/person). The ending '-lich' turns the noun into an adjective meaning 'like a human' or 'belonging to humans'.
Es ist eine zutiefst menschliche Eigenschaft, neugierig zu sein.
It is a deeply human quality to be curious.
Be careful not to confuse 'menschlich' (human) with 'männlich' (male). 'Menschlich' refers to all humans, while 'männlich' describes biological sex.
Sein Verhalten war nicht sehr menschlich.
His behavior was not very humane.
You can recognize the meaning of 'menschlich' (human/humane) from the context. In a biological context, it is about the body ('menschliche Zellen' — human cells). In a social context, it describes compassionate behavior ('ein menschlicher Chef' — a humane boss). In philosophical contexts, it refers to human nature ('menschliche Schwächen' — human weaknesses).
Die Ärzte studieren die Reaktion menschlicher Zellen auf das Medikament.
The doctors are studying the reaction of human cells to the medication.
In the meaning 'characteristic of humans', 'menschlich' (human) is often used with abstract nouns, such as 'menschliches Versagen' (human error), 'menschliche Schwächen' (human weaknesses), or 'die menschliche Natur' (human nature).
Der Unfall wurde auf menschliches Versagen zurückgeführt.
The accident was attributed to human error.
When 'menschlich' means 'compassionate' or 'humane', it often describes a person or their behavior. Typical phrases are 'jemanden menschlich behandeln' (to treat someone humanely) or 'eine menschliche Geste' (a humane gesture).
Es war eine sehr menschliche Geste, ihm in dieser schweren Zeit zu helfen.
It was a very humane gesture to help him during this difficult time.
In scientific or medical texts, 'menschlich' (human) refers to the body. Common combinations are 'der menschliche Körper' (the human body), 'das menschliche Skelett' (the human skeleton), or 'menschliche Organe' (human organs).
Das menschliche Herz schlägt in Ruhe etwa 60 bis 80 Mal pro Minute.
The human heart beats about 60 to 80 times per minute at rest.
Christian
'menschlich' and 'christlich' can both have to do with compassion, kindness, and helping others. 'menschlich' means generally understanding and warm in dealing with other people. It is not tied to a religion. 'christlich' refers to Christianity or to values associated with it, for example charity or forgiveness. The words can be confused when talking about good or helpful behavior. If you only want to say that someone acts with understanding, 'menschlich' fits. If the religious connection is important, 'christlich' fits.

Die Ärztin blieb ruhig und sprach sehr menschlich mit dem Patienten.
The doctor stayed calm and spoke to the patient in a very humane way.
Meine Nachbarin engagiert sich in einer christlichen Hilfsgruppe.
My neighbor is involved in a Christian aid group.