Con‐clu″sive (?), a. [Cf. F. conclusif.] Belonging to a close or termination; decisive; convincing; putting an end to debate or question; leading to, or involving, a conclusion or decision.
Secret reasons... equally conclusive for us as they were for them.
Rogers.
Conclusive evidence(Law), that of which, from its nature, the law allows no contradiction or explanation. — Conclusive presumption(Law), an inference which the law makes so peremptorily that it will not allow it to be overthrown by any contrary proof, however strong.
Syn. — Final; ultimate; unanswerable. See Final.