Conclusive (adjective)

1. Providing evidence or proof that something is definitely true or certain.
2. Putting an end to doubt or question.

Origin:

Late middle english: from latin conclus- "closed, finished", from the verb conclude, from con- "together" + claudere "to shut".

Examples:

1. The results of the study were conclusive.
2. The evidence was not conclusive.
3. The test results were conclusive.
4. The investigation results were conclusive.
5. The findings were conclusive.