De‐ci‐sive (?), 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.