endlos
endless
Without a spatial or temporal end; infinite.
Der Blick über das weite, endlose Meer war atemberaubend.
The view over the wide, endless sea was breathtaking.

endless
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endless
Without a spatial or temporal end; infinite.
Der Blick über das weite, endlose Meer war atemberaubend.
The view over the wide, endless sea was breathtaking.

The word is simply built from 'Ende' (end) and the suffix '-los' (-less), which means 'without'. 'Endlos' (endless) therefore literally means 'without end'.
Die Wüste schien eine endlose Weite aus Sand zu sein.
The desert seemed to be an endless expanse of sand.
'Endlos' (endless) can stand as an adjective before a noun or as an adverb describing a verb. As an adverb, it often expresses a subjective feeling about a long duration.
Wir standen in einer endlosen Schlange vor dem Eingang.
We stood in an endless line in front of the entrance.
In its literal meaning, 'endlos' (endless) is often used to describe large, unlimited spaces or landscapes, such as 'der endlose Himmel' (the endless sky), 'das endlose Meer' (the endless sea), or 'endlose Felder' (endless fields).
Die Straße führte endlos geradeaus durch die Landschaft.
The road led endlessly straight ahead through the landscape.
When 'endlos' (endless) describes a duration, it often has a negative connotation of impatience or boredom. It is frequently found with words such as 'Diskussion' (discussion), 'Warten' (waiting), 'Suche' (search), or 'Monolog' (monologue).
Seine endlose Geschichte über den letzten Urlaub hat alle gelangweilt.
His endless story about the last vacation bored everyone.
In the meaning 'very many', 'endlos' (endless) is often combined with abstract nouns that express a large amount or variety, e.g. 'endlose Möglichkeiten' (endless possibilities), 'eine endlose Liste' (an endless list), or 'endlose Variationen' (endless variations).
Das neue Software-Update bietet endlose neue Funktionen.
The new software update offers endless new features.
end
'das Ende' and 'endlos' belong to the same area of meaning, but they function very differently. 'das Ende' is a noun and refers to the end or boundary of something. 'endlos' is an adjective and describes something that has no end or feels very long. In the expression 'ohne Ende' (endlessly / no end of), 'Ende' can work similarly to 'endlos', for example when talking about a great deal of work. They can be confusing because both have to do with boundaries and duration. But you say 'das Ende der Straße' (the end of the street) and 'eine endlose Straße' (an endless street).

Wegen der vielen Fragen zog sich das Gespräch endlos hin.
Because of all the questions, the conversation dragged on endlessly.
Nach drei Stunden kam endlich das Ende der Sitzung.
After three hours, the meeting finally came to an end.