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adj. 1. Settling a matter or conflict; conclusive: the decisive battle in the war; the decisive piece of evidence in the lawsuit. 2. Characterized by or showing the ability to make decisions quickly and firmly; resolute: a decisive leader. de·cisive·ly adv. de·cisive·ness n. Synonyms: decisive, conclusive, critical, crucial, definitive, determinative These adjectives mean determining an outcome or settling an issue with finality: the decisive vote; a conclusive reason; a critical experiment; a crucial moment; a definitive verdict; the determinative battle. Antonym: indecisive |
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