Grammar fix

conclusive evidence

decisive evidence

evidence that is so strong and clear that it leaves no doubt and proves something completely.

collocationC1occasional

Hear it in context

Notice where the phrase sounds natural.

The DNA results provided conclusive evidence that he was at the scene.study
In my opinion, before making any major changes to the education system, policymakers should wait for conclusive evidence that the new methods actually improve student outcomes.IELTS speaking

Pattern: conclusive evidence (of/that + clause)

WrongThey found conclusive evidences.

RightThey found conclusive evidence.

'Evidence' is uncountable — no plural.

Patternconclusive evidence (of/that + clause)

Choose the version that sounds natural in speech.

Stiff The findings were of a definitive and irrefutable character.

Natural The evidence was conclusive.

'Definitive and irrefutable character' is overwrought; 'conclusive' carries the whole idea.

Words that usually travel with it.

'Conclusive evidence' is stronger than 'strong evidence' or 'clear evidence.' It means the matter is settled and no further proof is needed.