
vernichten
to destroy
To destroy something completely so that it no longer exists.
Das Feuer hat leider alle alten Dokumente im Archiv vernichtet.
Unfortunately, the fire destroyed all the old documents in the archive.
to destroy / annihilate
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to destroy
To destroy something completely so that it no longer exists.
Das Feuer hat leider alle alten Dokumente im Archiv vernichtet.
Unfortunately, the fire destroyed all the old documents in the archive.

to annihilate
To defeat an opponent or competitor completely and overwhelmingly.
Die Heimmannschaft hat den Gegner im Finale mit 6:0 vernichtet.
The home team annihilated their opponent 6-0 in the final.

to destroy
To destroy someone mentally or morally through extremely negative criticism or judgment.
Der Verriss in der Zeitung hat den Ruf des Autors fast vernichtet.
The scathing review in the newspaper almost destroyed the author's reputation.
The word derives from 'zu nichte machen' (to reduce to nothing). It literally means to turn something into 'Nichts' (nothing). This explains why the word has such a strong and final meaning.
Ein Computervirus kann alle Daten auf der Festplatte vernichten.
A computer virus can destroy all the data on the hard drive.
'Vernichten' (to destroy/annihilate) is a very strong word and expresses total destruction or an absolute defeat. It is much more intense than, for example, 'kaputt machen' (to break) or 'besiegen' (to defeat).
Die Flutwelle drohte, das ganze Dorf zu vernichten.
The tidal wave threatened to destroy the whole village.
The prefix 'ver-' is inseparable. It remains firmly attached to the verb stem in all tenses and sentence constructions.
Der Sturm hat die gesamte Ernte vernichtet.
The storm destroyed the entire harvest.
The object of the sentence reveals the exact meaning. If it is about physical things (files, buildings), it is about destruction. With opponents (team, army), it is about total defeat. With abstract things (reputation, hope), it is about moral destruction.
Er hat aus Wut alle Briefe von ihr vernichtet.
Out of anger, he destroyed all the letters from her.
to destroy
Zerstören means that an object loses its shape or function; it may also disappear completely. Vernichten emphasizes more strongly that it is completely eliminated and no longer exists. Therefore, zerstören is often suitable for unusable remains, while vernichten is used for total annihilation.

Der Brand vernichtete die Holzhütte, sodass nichts von ihr übrig blieb.
The fire annihilated the wooden hut, leaving nothing behind.
Der Brand zerstörte die Holzhütte, doch einige verkohlte Balken blieben stehen.
The fire destroyed the wooden hut, but a few charred beams were still standing.