conclusive
Americanadjective
-
serving to settle or decide a question; decisive; convincing.
conclusive evidence.
- Synonyms:
- definitive
-
tending to terminate; closing.
adjective
-
putting an end to doubt; decisive; final
-
approaching or involving an end or conclusion
Other Word Forms
Etymology
Origin of conclusive
1580–90; < Late Latin conclūsīvus, equivalent to Latin conclūs ( us ) (past participle of conclūdere to conclude; see conclusion) + -īvus -ive
Explanation
If you've got a theory that you're trying to prove, and you uncover a conclusive piece of evidence, then the case is closed. Conclusive means you've got your answer, you've proved your theory, and there can't be any doubt about it. If want to prove that frogs can speak, and you record a frog reciting "The Midnight Ride of Paul Revere," that would be conclusive evidence for your claim. But if the frog seemed to be mumbling and mainly making regular old frog noises, critics would say that your video was not conclusive. You can also use the word conclusive to describe winning something easily or by a large margin, like when the talent competition judges handed the tap-dancing bear a conclusive victory, and he moved on triumphantly to the finals.
Vocabulary lists containing conclusive
The Emancipation Proclamation (1862)
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Case Closed: Clud, Clus
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The Articles of Confederation (1777)
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The four received "conclusive grounds" decisions that they were victims between May and July.
From Barron's ● Aug. 2, 2026
The report said the probe uncovered “no conclusive evidence” Neal and Clement were in a romantic relationship, or that her promotion had been handled incorrectly.
From The Wall Street Journal ● Jul. 22, 2026
Lloyd's said the pair breached compliance rules by not disclosing their relationship but found no conclusive evidence they had a romantic relationship while at Lloyd's.
From BBC ● Jul. 22, 2026
While this is the case for retail investors, the evidence for hedge funds is less conclusive and JPMorgan doesn’t think it’s particularly stretched at present when comparing it to previous periods of overly-extended positioning.
From MarketWatch ● Jun. 25, 2026
A review of the other factors set out above does not provide conclusive evidence that the witness, Ralph Meyers, perjured himself at the original trial.
From "Just Mercy" by Bryan Stevenson
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
