
einsam
lonely
The negative feeling of being alone and without social contacts; feeling separated from others.
Obwohl er viele Bekannte hatte, fühlte er sich oft einsam.
Although he had many acquaintances, he often felt lonely.
lonely / remote
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lonely
The negative feeling of being alone and without social contacts; feeling separated from others.
Obwohl er viele Bekannte hatte, fühlte er sich oft einsam.
Although he had many acquaintances, he often felt lonely.

remote / deserted
Describes a place that is remote, deserted, and quiet.
Sie fanden eine einsame Bucht, in der sie ungestört schwimmen konnten.
They found a secluded cove where they could swim undisturbed.
The word consists of 'ein' (one) and the suffix '-sam', which describes a quality or tendency. 'Einsam' (lonely) therefore describes the state or feeling of being alone.
Nach dem Umzug fühlte er sich in der neuen Stadt sehr einsam.
After the move, he felt very lonely in the new city.
The meaning of 'einsam' (lonely / remote) depends on the context. If it refers to a person and their feelings, it means 'lonely'. If it describes a place, it means 'remote' or 'deserted'.
Er ist ein einsamer Mensch, der nur wenige Freunde hat.
He is a lonely person who has only a few friends.
When referring to the feeling, 'einsam' (lonely) is often combined with verbs like 'sich fühlen' (to feel), 'sein' (to be), or 'werden' (to become). A typical phrase is 'sich einsam fühlen' (to feel lonely).
Im Alter werden viele Menschen einsam.
In old age, many people become lonely.
When describing a place, 'einsam' (remote / deserted) often comes before nouns like 'Insel' (island), 'Strand' (beach), 'Hütte' (cabin), 'Gegend' (area), or 'Tal' (valley).
Der Wanderweg führte durch ein einsames Tal.
The hiking trail led through a remote valley.
alone / only
Allein initially describes only the fact that a person has no company. Einsam, by contrast, refers to the negative feeling of being separated from others. Someone who is alone therefore does not necessarily feel lonely; someone who suffers from a lack of contact is einsam (lonely).

Weil Lea zu Hause niemanden zum Reden hat, fühlt sie sich einsam.
Because Lea has no one to talk to at home, she feels lonely.
Obwohl Lea gern allein zu Hause ist, fühlt sie sich dabei wohl.
Although Lea likes being alone at home, she feels comfortable that way.