overevaluation

/ˌoʊvərɪˌvæljuˈeɪʃən/
noun
  1. The act of judging something as being more valuable, important, or good than it really is.
    • The overevaluation of his skills led to disappointment when he couldn't do the job.
    • Many investors warned against the overevaluation of the company's stock.
    • Her overevaluation of the antique vase meant she refused a fair offer.
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