: weighing less than the normal or requisite amount
Examples of underweight in a Sentence
Adjective
the long illness left him frail and underweight
Recent Examples on the Web
Michael MacKenzie, Bloomberg, 27 Jan. 2026
One was a listless, underweight female goat with no appetite.
—Nicole Blanchard, Idaho Statesman, 23 Dec. 2025
It's dehydrated, critically underweight and has frostbite and wounds on its feet.
—Madeline Bartos, CBS News, 9 Dec. 2025
Mutual funds lean overweight financials while hedge funds are underweight, and hedge funds are overweight consumer discretionary as mutual funds pull back.
—Yun Li, CNBC, 28 Nov. 2025
See All Example Sentences for underweight
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Adjective
However, even those who are currently underweight the long end — holding less of the maturities than benchmarks dictate — say climbing yields could spur them into action.
—Michael MacKenzie, Bloomberg, 27 Jan. 2026
One was a listless, underweight female goat with no appetite.
—Nicole Blanchard, Idaho Statesman, 23 Dec. 2025
It's dehydrated, critically underweight and has frostbite and wounds on its feet.
—Madeline Bartos, CBS News, 9 Dec. 2025
Mutual funds lean overweight financials while hedge funds are underweight, and hedge funds are overweight consumer discretionary as mutual funds pull back.
—Yun Li, CNBC, 28 Nov. 2025
See All Example Sentences for underweight
Cite this Entry
“Underweight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underweight. Accessed 6 Feb. 2026.
Copy CitationMedical Definition
underweight
adjective
un·der·weight
-ˈwāt 
: weighing less than the normal amount for one's age, height, and build
underweight children
underweight adults typically have a body mass index of less than 18.5
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