widerlegen
to refute
To show with evidence or arguments that a claim, theory, or accusation is false.
Die neuen Forschungsergebnisse widerlegen die alte Theorie vollständig.
The new research findings completely refute the old theory.

to refute
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to refute
To show with evidence or arguments that a claim, theory, or accusation is false.
Die neuen Forschungsergebnisse widerlegen die alte Theorie vollständig.
The new research findings completely refute the old theory.

The prefix 'wider-' means 'against'. The verb is inseparable, meaning the prefix remains firmly attached to the verb in all sentence forms and is not placed at the end of the sentence.
Der Anwalt widerlegte die Aussage des Zeugen.
The lawyer refuted the witness's statement.
You always refute something abstract that was previously claimed. Typical accusative objects are: a theory, a claim, a rumor, an argument, or an accusation.
Mit neuen Daten konnte der Wissenschaftler die alte Theorie widerlegen.
With new data, the scientist was able to refute the old theory.
'Widerlegen' (to refute) is a written-language word and is used mainly in formal, scientific, legal, or journalistic contexts. It sounds very precise and educated.
In seinem Artikel widerlegt der Autor die gängige Meinung.
In his article, the author refutes the common opinion.
to confirm
'bestätigen' and 'widerlegen' are opposites when it comes to statements or information. With 'bestätigen', you show or say that something is correct or true. With 'widerlegen', you show through evidence or arguments that something is false. 'bestätigen' also fits with appointments or messages, while 'widerlegen' is used more with claims, accusations, or theories. In short: 'bestätigen' makes a statement stronger; 'widerlegen' proves it false.

Der Zeuge konnte den Vorwurf mit einer Nachricht widerlegen.
The witness was able to refute the accusation with a message.
Die Praxis bestätigt den Termin am Telefon.
The medical practice confirms the appointment by phone.