decisive

adjectives

determining or having the power to determine an outcome
"cast the decisive vote"; "two factors had a decisive influence"
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antonym
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having the power or quality of deciding
"the crucial experiment"; "cast the deciding vote"; "the determinative (or determinant) battle"
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having momentous consequences; of decisive importance
"that fateful meeting of the U.N. when...it declared war on North Korea"- Saturday Rev; "the fatal day of the election finally arrived"
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putting an end to all debate or action
"a peremptory decree"
see also
forming an end or termination; especially putting an end to doubt or question
"conclusive proof"; "the evidence is conclusive"
see also
of extreme importance; vital to the resolution of a crisis
"a crucial moment in his career"; "a crucial election"; "a crucial issue for women"
unmistakable
"had a decisive lead in the polls"
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precise; explicit and clearly defined
"I want a definite answer"; "a definite statement of the terms of the will"; "a definite amount"; "definite restrictions on the sale of alcohol"; "the wedding date is now definite"; "a definite drop in attendance"
characterized by decision and firmness
"an able and decisive young woman"; "we needed decisive leadership"; "she gave him a decisive answer"
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antonym
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characterized by quickness and firmness
"his reply was unhesitating"
see also
firm in purpose or belief; characterized by firmness and determination
"stood resolute against the enemy"; "faced with a resolute opposition"; "a resolute and unshakeable faith"
forming or having the nature of a turning point or crisis
"a critical point in the campaign"; "the critical test"
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