complex
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complex
Consisting of many different, interconnected parts; complicated, multi-layered, and difficult to understand.
Die Regeln des Spiels sind so komplex, dass ich sie immer wieder vergesse.
The rules of the game are so complex that I keep forgetting them.
As an adjective, 'komplex' (complex) can stand before a noun or be used with verbs like 'sein' (to be), 'wirken' (to seem), or 'erscheinen' (to appear). It then describes a characteristic of the thing or situation.
Das ist ein sehr komplexes Thema.
That is a very complex topic.
'Komplex' (complex) is often used to describe abstract things. Typical nouns are 'ein komplexes System' (a complex system), 'ein komplexes Problem' (a complex problem), 'eine komplexe Aufgabe' (a complex task), or 'eine komplexe Struktur' (a complex structure).
Die Ingenieure arbeiten an einem sehr komplexen System.
The engineers are working on a very complex system.
The word 'komplex' (complex) belongs to a rather formal or educated register. It is often found in scientific, technical, or political texts.
Die politische Lage in der Region ist äußerst komplex.
The political situation in the region is extremely complex.
complicated
Komplex and kompliziert can both describe something with many interconnected parts. Komplex focuses more on this multilayered structure, while kompliziert emphasizes that it is therefore difficult to understand or solve. Depending on the perspective, both words can fit the same situation.
Das neue System ist komplex, weil viele Abteilungen und Abläufe miteinander verbunden sind.
The new system is complex because many departments and processes are interconnected.
Das neue System ist kompliziert, weil die Mitarbeiter seine Abläufe kaum verstehen.
The new system is complicated because the employees can barely understand how it works.
