overoptimism
noun
over·op·ti·mism
ˌō-vər-ˈäp-tə-ˌmi-zəm
: an excessive or unrealistic degree of optimism
… folks tend toward overoptimism about their prospects and their skills.—Bill Alpert
overoptimistically
adverb
Wilma values her car at $10,000 and overoptimistically thinks she can sell it for $20,000, which is more than anyone will actually pay.
—Sanford Ikeda
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Merriam-Webster unabridged
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