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Adjective: decisive  di'sI-siv
  1. Determining or having the power to determine an outcome
    "cast the decisive vote"; "two factors had a decisive influence"
  2. Characterized by decision and firmness
    "an able and decisive young woman"; "we needed decisive leadership"; "she gave him a decisive answer"
  3. Unmistakable
    "had a decisive lead in the polls"
  4. Forming or having the nature of a turning point or crisis
    "a decisive point in the campaign";
    - critical, climacteric

See also: conclusive, crucial, deciding, definite, determinant, determinative, determining, fatal, fateful, important, peremptory, resolute, unhesitating

Antonym: indecisive