: 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
Brandi D. Addison,
USA Today,
2 July 2026
When the 13 siblings were rescued, all but the 2-year-old were severely underweight and hadn’t bathed for months.
—
ABC News,
2 July 2026
Authorities said many of the dogs suffered from severe flea infestation, and some of the pups were underweight.
—
Leonard Greene,
New York Daily News,
19 June 2026
Looking beyond Taiwan Ken Wong, Asia equity portfolio specialist at Eastspring Investments, is underweight Taiwan, and overweight South Korea.
—
Michael Considine,
CNBC,
16 June 2026
See All Example Sentences for underweight
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Adjective
Some pups were weaned early or became underweight, and more than 4,000 young sea lions were found stranded along California beaches during peak years, overwhelming rehabilitation centers.
—
Brandi D. Addison,
USA Today,
2 July 2026
When the 13 siblings were rescued, all but the 2-year-old were severely underweight and hadn’t bathed for months.
—
ABC News,
2 July 2026
Authorities said many of the dogs suffered from severe flea infestation, and some of the pups were underweight.
—
Leonard Greene,
New York Daily News,
19 June 2026
Looking beyond Taiwan Ken Wong, Asia equity portfolio specialist at Eastspring Investments, is underweight Taiwan, and overweight South Korea.
—
Michael Considine,
CNBC,
16 June 2026
See All Example Sentences for underweight
Cite this Entry
“Underweight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underweight. Accessed 5 Jul. 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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