: 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
Lee Ying Shan, CNBC, 13 Aug. 2025
For example, reward systems often overweight drive and underweight temperance, with a focus on results at any cost.
—Mary Crossan, Forbes.com, 23 July 2025
People are considered underweight if their BMI is lower than 18.5.
—Sandee Lamotte, CNN Money, 24 June 2025
The cat was discovered when the container was opened in Oakdale, Minnesota, extremely dehydrated and dangerously underweight, but miraculously alive!
See how this courageous cat survived trip from China to Minnesota below.
—Kendall Malinchock, USA Today, 24 June 2025
See All Example Sentences for underweight
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Adjective
One area investors are underweight on is clean technology.
—Lee Ying Shan, CNBC, 13 Aug. 2025
For example, reward systems often overweight drive and underweight temperance, with a focus on results at any cost.
—Mary Crossan, Forbes.com, 23 July 2025
People are considered underweight if their BMI is lower than 18.5.
—Sandee Lamotte, CNN Money, 24 June 2025
The cat was discovered when the container was opened in Oakdale, Minnesota, extremely dehydrated and dangerously underweight, but miraculously alive!
See how this courageous cat survived trip from China to Minnesota below.
—Kendall Malinchock, USA Today, 24 June 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 3 Sep. 2025.
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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