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Synonyms
de·ci·sive (dĭ-sī́sĭv)

adjective 

  1. Having the power to decide; conclusive.
  2. Characterized by decision and firmness; resolute.
  3. Beyond doubt; unmistakable: a decisive defeat.

derivatives

de·císive·ly
adverb
de·císive·ness
noun

synonyms:

decisive, conclusive, crucial, definitive, determinative These adjectives mean determining or having the power to determine an outcome: the decisive vote; a conclusive reason; crucial experiments; a definitive verdict; the determinative battle.
Antonym: indecisive