overoptimism

noun
over·op·ti·mism | \ˌō-vər-ə-ˈäp-tə-ˌmi-zəm \

Definition of overoptimism 

: an excessive or unrealistic degree of optimism … folks tend toward overoptimism about their prospects and their skills.— Bill Alpert

Other Words from overoptimism

overoptimistic \ˌō-vər-ə-ˌäp-tə-ˈmi-stik \ adjective
overoptimistic projections for the future
overoptimistically \ˌō-vər-ə-ˌäp-tə-ˈmi-sti-k(ə-)lē \ 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

First Known Use of overoptimism

1898, in the meaning defined above

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The first known use of overoptimism was in 1898

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