decisive

[adj] - unmistakable 2. [adj] - characterized by decision and firmness 3. [adj] - determining or having the power to determine an outcome
Found on http://www.webdictionary.co.uk/definition.php?query=decisive

Decisive

De·ci·sive adjective [ Confer French 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.'
Found on http://www.encyclo.co.uk/webster/D/16

decisive

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.' ... 2. Marked by promptness and decision. 'A noble instance of this attribute of the decisive character.' (J. Foster) ... Synonym: ...
Found on http://www.encyclo.co.uk/local/20973

decisive

adjective unmistakable; `had a decisive lead in the polls`
Found on https://www.encyclo.co.uk/local/20974

Decisive

• (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.
Found on http://thinkexist.com/dictionary/meaning/decisive/
No exact match found