conclusive
kun-KLOO-sivadjMeaning settling a question beyond doubt
Memory hook con-CLUE-sive: the CLUE that closes the case. Muddy paw prints lead from the door straight to the dog asleep on the sofa: the last clue that closes the case. The evidence is conclusive.
The muddy paw prints on the sofa were conclusive: the dog had been inside.
In context Earlier studies had only hinted at the answer, but this one was conclusive: it tested thousands of samples and left no room for doubt.
Similar decisive, definitive, convincing, final
Opposite inconclusive, doubtful, questionable
From Latin concludere, “to close up”: con (thoroughly) + claudere (to shut).