If you make decisions quickly, you are someone who is decisive. A decisive event can settle something, like a war.
People who are wishy-washy are the opposite of decisive: being decisive means you don't waffle or take forever to make up your mind, and then you stick by what you decided. People admire politicians, coaches, and friends who are decisive. In sports, if a home run won the game, that was the decisive run. When you reach a crisis point in life — when things are going to change one way or the other — you've reached a decisive moment.
adj characterized by decision and firmness
characterized by quickness and firmness
firm in purpose or belief; characterized by firmness and determination
characterized by lack of decision and firmness
on the fence, undecided
characterized by indecision
lacking decisiveness of character; unable to act or decide quickly or firmly
undecided or characterized by indecisiveness
uncertain how to act or proceed
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adj determining or having the power to determine an outcome
forming an end or termination; especially putting an end to doubt or question
of extreme importance; vital to the resolution of a crisis
deciding, determinant, determinative, determining
having the power or quality of deciding
having momentous consequences; of decisive importance
putting an end to all debate or action