Webster’s Revised Unabridged Dictionary · 1913
Decisive
De·ci·sive (dē·sī′sĭv), a. [Cf. F. décisif. See Decision.] 1. Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive. "A decisive, irrevocable doom." Bates. "Decisive campaign." Macaulay. "Decisive proof." Hallam.
2. Marked by promptness and decision.
A noble instance of this attribute of the decisive character. J. Foster.
Syn. — Decided; positive; conclusive. See Decided.
— De·ci′sive·ly, adv. — De·ci′sive·ness, n.