decisive
adjective
determining or having the power to determine an outcome
“cast the decisive vote”
“two factors had a decisive influence”
Oppositesindecisiveunmistakable
“had a decisive lead in the polls”
characterized by decision and firmness
“an able and decisive young woman”
“we needed decisive leadership”
Oppositesindecisiveforming or having the nature of a turning point or crisis
“a critical point in the campaign”
“the critical test”
Synonymscritical
Source: WordNet 3.1, Princeton University
