
unendlich
infinite
Without end, without limits; not limited in extent, duration, or quantity.
Die Weite des Universums erscheint uns unendlich.
The vastness of the universe seems infinite to us.
infinite
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infinite
Without end, without limits; not limited in extent, duration, or quantity.
Die Weite des Universums erscheint uns unendlich.
The vastness of the universe seems infinite to us.

incredibly
Used colloquially as an intensifier meaning 'very great', 'enormous', or 'extremely'.
Ich habe unendlich viel zu tun und weiß nicht, wo ich anfangen soll.
I have an incredible amount to do and don't know where to start.
The word is easy to understand if you analyze its structure: the prefix 'un-' means 'not', the root is 'Ende' (end), and '-lich' turns it into an adjective. 'Unendlich' therefore literally means 'without end'.
Die Liste der Aufgaben schien unendlich.
The list of tasks seemed infinite.
The literal meaning 'without end' is often found in philosophical or scientific contexts. The colloquial meaning 'very' or 'enormously' is used as an intensifier before adjectives or with 'viel' (much/a lot).
Die unendliche Ausdehnung des Weltalls fasziniert die Menschen.
The infinite expanse of space fascinates people.
In its literal meaning, 'unendlich' is often combined with abstract nouns that describe an extent or quantity. Typical examples are 'unendliche Weite' (infinite vastness), 'unendliche Liebe' (infinite love), or 'unendliche Möglichkeiten' (infinite possibilities).
Diese Software bietet unendliche Möglichkeiten zur Gestaltung.
This software offers infinite possibilities for design.
In colloquial speech, 'unendlich' often serves as a strong intensifier like 'sehr' (very) or 'total' (totally). It then comes directly before an adjective or before 'viel' (much/a lot).
Der Film war unendlich langweilig.
The film was incredibly boring.
eternal / ages
For a duration without an end, both ewig and unendlich can be appropriate. Ewig directly says that something continues forever. Unendlich more generally refers to the absence of a limit and can express forms of boundlessness other than duration as well.

In der Vorstellung der Erzählerin setzt sich die Zeit unendlich fort.
In the narrator's imagination, time continues infinitely.
Der Legende nach soll dieses Licht ewig brennen.
According to legend, this light is supposed to burn forever.