decisive

adjective3

1. •
   Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.
2. •
   Decided; definite; incontrovertible.

   • [F]abulous forces are there encountered and a decisive victory is won: […] — 1949
3. •
   Marked by promptness and decision, resolute; without hesitation.

   • A noble instance of this attribute of the decisive character. — 1804