overestimation

/ˌoʊvərˌɛstɪˈmeɪʃən/
noun
  1. The act of judging something to be larger, more important, or more valuable than it really is.
    • The company's overestimation of demand caused a huge surplus of products.
    • An overestimation of the distance made them run out of water before reaching the camp.
    • His overestimation of his own abilities led to a failed project.
Synonyms
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