gump·tion ˈɡəmpSH(ə)n/ _noun_informal

shrewd or spirited initiative and resourcefulness. “she had the gumption to put her foot down and head Dan off from those crazy schemes”

synonyms:

initiative, resourcefulness, enterprise, ingenuity, imagination;astuteness, shrewdness, acumen, sense, common sense, wit, mother wit, practicality; spirit, backbone, pluck, mettle, nerve, courage,wherewithal; informalget-up-and-go, spunk, oomph, moxie, savvy, horse sense, (street) smarts

​the ability to decide what is the best thing to do in a particular situation, and to do it with energy and determination: She had the gumption to write directly to the company manager and​ ​ persuade him to give her a job.

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