decisive

adjective

de·​ci·​sive di-ˈsī-siv 

1

: having the power or quality of deciding

The council president cast the decisive vote.

a decisive battle

2

: resolute, determined

a decisive manner

decisive leaders

a decisive editor

3

: unmistakable, unquestionable

a decisive superiority

decisively adverb

decisiveness noun

Synonyms of decisive

• resolute
• determined
• intent
• positive
• confident

Choose the Right Synonym for decisive

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 decisive in a Sentence

You must be decisive and persistent to succeed in this competitive field.

I stood there wondering what to do, but my sister was more decisive and immediately went to the phone.

The fight ended with a decisive blow.

the decisive battle of the war

The poverty of his childhood played a decisive role in his adult life.

The meeting is seen as a decisive step toward a peace treaty.

Recent Examples on the Web

Either way, this decisive energy favors clear asks and tangible action over chasing perfect conditions. —Tarot.com, New York Daily News, 9 Apr. 2026

The Aggies lost Game 2, and the decisive Game 3. —Mac Engel april 8, Fort Worth Star-Telegram, 8 Apr. 2026

Leung said the current move reflects more of a positioning reset than a decisive shift back to a sustained risk-on environment. —Lee Ying Shan, CNBC, 8 Apr. 2026

His statement threatening to eradicate an entire civilization shocks the conscience and requires a decisive congressional response. —Eric McDaniel, NPR, 7 Apr. 2026

Word History

Etymology

borrowed from Middle French & Medieval Latin; Middle French decisif, borrowed from Medieval Latin dēcīsīvus, from Latin dēcīsus, past participle of dēcīdere "to cut off, cut out, mark by cutting, settle, choose as a course of action" + -īvus -ive — more at decide

First Known Use

1584, in the meaning defined at sense 1

Phrases Containing decisive

• decisive action
• decisive/deciding/determining factor

Rhymes for decisive

• divisive
• incisive
• indecisive

Kids Definition

decisive

adjective

de·​ci·​sive di-ˈsī-siv 

1

: having the power to decide

the decisive vote

2

: unmistakable, unquestionable

a decisive victory

3

: marked by or showing decision

a decisive manner

decisively adverb

decisiveness noun