decisive

adj. conclusive; decided; final

Adjective
1. determining or having the power to determine an outcome; "cast the decisive vote"; "two factors had a decisive influence"
(antonym) indecisive
(similar) conclusive
(see-also) conclusive
2. unmistakable; "had a decisive lead in the polls"
(similar) definite
3. characterized by decision and firmness; "an able an decisive young woman"; "we needed decisive leadership"; "she gave him a decisive answer"
(antonym) indecisive
(similar) unhesitating, resolute
(see-also) resolute
4. forming or having the nature of a turning point or crisis; "a critical point in the campaign"; "the critical test"
(synonym) critical
(similar) crucial, important

adj. decisive, crucial, decided, definitive, fateful, peremptory, final; winning; high

adj. decisive, plump, conclusive, definitive, crucial, final

(a.)
Marked by promptness and decision.
  

(a.)
Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.