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 of conclusive

• 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

However, a three-judge panel selected for a legal assessment of the findings found that the investigation was not conclusive enough. —ABC News, 19 June 2026

Bartošák-Harlow said there's no conclusive evidence of who has and who has not paid a toll in the past, and there wasn't any sort of record, adding that companies should not be paying a toll for passage through an international waterway. —Tom Bowman, NPR, 17 June 2026

The information, which Daniel was hired to protect but now wants to disclose, is footage providing conclusive evidence of the arrival of aliens on Earth, in 1947, and of a seventy-nine-year coverup, with government complicity, by a company called WARDEX, headed by Noah Scanlon (Colin Firth). —Richard Brody, New Yorker, 16 June 2026

There’s no conclusive evidence of alien life or government cover-ups. —Collin Binkley, Fortune, 15 June 2026

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