D defs.my
Entry 2 senses Webster, 1913

Decisive

/dĭs-īs'-ĭv/ · De·ci·sive · IPA /dɪˈsaɪsɪv/
01 a. Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.
  1. 1.
    Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.
  2. 2.
    Marked by promptness and decision.
    “A noble instance of this attribute of the decisive character.” — J. Foster.