conclusive

adjective

con·​clu·​sive kən-ˈklü-siv 

-ziv

1

: of, relating to, or being a conclusion

2

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

The results were not conclusive.

conclusively adverb

conclusiveness noun

Synonyms

• definitive
• decisive
• last
• clear
• determinative

Choose the Right Synonym for conclusive

conclusive, decisive, determinative, definitive mean bringing to an end.

conclusive applies to reasoning or logical proof that puts an end to debate or questioning.

conclusive evidence

decisive may apply to something that ends a controversy, a contest, or any uncertainty.

a decisive battle

determinative adds an implication of giving a fixed character or direction.

the determinative factor in the court's decision

definitive applies to what is put forth as final and permanent.

the definitive biography

Examples of conclusive in a Sentence

the archeological discovery was conclusive proof that the Vikings had indeed settled in North America around 1000 A.D.

a conclusive argument for allowing the students to put on a play of their own choosing

Recent Examples on the Web

The series had a rather shocking ending, and in some ways, seemed pretty conclusive. —Paul Tassi, Forbes.com, 25 June 2025

Those observations proved less conclusive than had been hoped, but during the rest of the voyage, Cook was able to map the coastland of New Zealand before sailing west to the southeastern coast of Australia—the first record of Europeans on the continent's Eastern coastline. —ArsTechnica, 24 June 2025

There’s little conclusive evidence yet that creatine boosts cognition. —Staff Author Published, Verywell Health, 11 June 2025

While some research in animals and human cells suggests glyphosate may cause DNA damage and atrazine could mess with hormones, there isn’t currently any conclusive evidence of harm in people based on how we’re being exposed (including in relation to cumulative risk). —Erica Sloan, SELF, 10 June 2025

Word History

Etymology

see conclude

First Known Use

1536, in the meaning defined at sense 1

Rhymes for conclusive

• abusive
• allusive
• collusive
• conducive
• delusive
• diffusive
• elusive
• exclusive
• extrusive
• illusive
• inclusive
• intrusive

Kids Definition

conclusive

adjective

con·​clu·​sive kən-ˈklü-siv 

-ziv

: decisive sense 1, convincing

conclusive proof

conclusively adverb

conclusiveness noun

Legal Definition

conclusive

adjective

con·​clu·​sive

1

: of, relating to, or being a conclusion

2

: putting an end to debate or question especially by reason of inability to be refuted

conclusively adverb

conclusiveness noun