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.

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.
finally / finite
'endlich' and 'unendlich' are opposites when 'endlich' means that something has a limit or an end. 'unendlich' then means without end or without limits. The words can be confusing because 'endlich' also has another meaning: it can mean that something happens after a long wait. In this meaning, 'unendlich' is not the opposite. In addition, 'unendlich' is sometimes used as an intensifier, for example for very strong feelings or very large amounts. So pay attention to the context: limit and end, or relief after waiting.

Simon hatte unendlich viele Fragen zu dem neuen Spiel.
Simon had an incredible number of questions about the new game.
Unsere Zeit ist endlich, deshalb sollten wir sie gut nutzen.
Our time is finite, so we should make good use of it.