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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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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 Moore, Ward

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