noun
a person or thing that has the ability to make decisions quickly and effectively
adjective
showing the ability to make decisions quickly and effectively
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The board members made a decisive decision to invest in the new project.
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She made a really decisive move in the game and won in just a few moves.
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He dropped out of school, but that was a decisive move for him to pursue his passion.
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The artist's use of bold colors was a decisive choice in creating a powerful impact in the painting.