conclusive

/kən-ˈklü-siv/

adjective

  1. of, relating to, or being a conclusion

  2. putting an end to debate or question especially by reason of irrefutability

conclusive decisive determinative definitive mean bringing to an end. conclusive applies to reasoning or logical proof that puts an end to debate or questioning. decisive may apply to something that ends a controversy, a contest, or any uncertainty.