overreckoning

/ˌoʊvərˈrɛkənɪŋ/
noun
  1. An estimate or calculation that is too high; a miscalculation resulting from overestimating.
    • The budget was based on an overreckoning of expected sales.
    • The project failed due to an overreckoning of the available resources.
    • His overreckoning of his own abilities led to a disappointing performance.
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