Decisive Definition

dĭ-sīsĭv
adjective
That settles or can settle a dispute, question, etc.; conclusive.
Decisive evidence.
Webster's New World
Determining or closely affecting what comes next; critically important; crucial.
A decisive moment in his career.
Webster's New World
Having the quality of decision; showing determination or firmness.
A decisive tone of voice.
Webster's New World

Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.

A decisive battle is fatal for one side's war chances.
Wiktionary
Antonyms:

Origin of Decisive

  • From Middle French décisif

    From Wiktionary

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