overoptimism

British

/ ˌəʊvərˈɒptɪˌmɪzəm /

noun

excessive hopefulness or confidence

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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overoptimism

If the concentration reflects an expanding market bubble spawned by overoptimism about AI, then continuing to invest in index funds is too risky.

From The Wall Street Journal ● Mar. 22, 2026

“I think there’s probably a little bit of overoptimism there,” Pinsky says.

From MarketWatch ● Dec. 12, 2025

According to the authors this shows that reducing negative emotions can lessen overoptimism.

From Science Daily ● Mar. 28, 2024

In recent days, Kerry has cautioned against overoptimism and warned that the talks could fail.

From Washington Post ● Jul. 6, 2015

I urged the PM to be cautious about overoptimism in giving out the news.

From Greener Than You Think by Ward Moore

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023