noun
shrewd or spirited initiative and resourcefulness
adjective
having or showing shrewdness and determination
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She showed great gumption in taking on the leadership role during the company's restructuring.
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I admire your gumption for starting your own business from scratch.
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That guy's got some serious gumption to ask his boss for a raise after only a month on the job.
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Sometimes all it takes is a little gumption to push through obstacles and reach your goals.