Final answer:
The antonym of 'conclusive' is unconvincing. Conclusive means coming to an end or settling an issue, while unconvincing means not persuasive or not able to convince someone of something.
Step-by-step explanation:
Conclusive means coming to an end or settling an issue, while unconvincing means not persuasive or not able to convince someone of something. For example, if a scientific experiment produces conclusive results, it means that the findings are final and decisive. On the other hand, if the evidence presented is unconvincing, it means that it fails to persuade or make a strong case.