The inconclusivity of the evidence made it difficult to determine the culprit.

The investigation into the crime was inconclusive.

The investigation ended inconclusively.

The inconclusiveness of the evidence made it difficult to reach a verdict.

The inconclusivenesses of the study made it difficult to draw any definitive conclusions.

There were many inconclusions in the research findings.

The meeting ended without any inconclusion.

The evidence presented in the trial was inconclusible.