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brain fog
noun
: a usually temporary state of diminished mental capacity marked by inability to concentrate or to think or reason clearly
Examples of brain fog in a Sentence
Recent Examples on the Web
Among those who do get antibiotics, anywhere between 10 and 25 percent develop long-term symptoms — such as fatigue, brain fog or dizziness.
—Trisha Pasricha, Washington Post, 17 June 2024
All of them had previously tested positive for COVID-19, lived with Long COVID symptoms for at least 90 days, and currently experienced at least two of six major symptoms: fatigue, brain fog, body aches, cardiovascular issues, shortness of breath, and gastrointestinal issues.
—Jamie Ducharme, TIME, 7 June 2024
Young, who lives in Connecticut, was unable to pursue a college degree due to her severe fatigue, brain fog, pain, and allergic reactions to most medications.
—TIME, 16 May 2024
Libra September 23 – October 22 A bad case of brain fog is heading your way.
—Tarot.com, Baltimore Sun, 8 Mar. 2024
See all Example Sentences for brain fog
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'brain fog.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
First Known Use
1853, in the meaning defined above
Dictionary Entries Near brain fog
Cite this Entry
“Brain fog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brain%20fog. Accessed 4 Jul. 2024.
Medical Definition
brain fog
noun
: a usually temporary state of diminished mental capacity marked by inability to concentrate or to think or reason clearly
This brain fog can be a result of being overly stressed, tired, carrying extra weight, consuming too many calories or consistently consuming a diet poor in nutrients.—Kylie Helgens, The Gazette (Cedar Rapids, Iowa)
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