: 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
Lydia Patrick, MSNBC Newsweek, 3 July 2025
His tire management mastery won the 2024 Belgian GP before Russell was ultimately disqualified for his car being underweight.
—Alex Kalinauckas, New York Times, 20 June 2025
But there were also broader losses in reading and math proficiency, lower preschool enrollment and a higher rate of babies born underweight.
—Laura Tillman, Hartford Courant, 12 June 2025
Found as a stray last August, Gilly was dangerously underweight and had clearly been through a lot.
—Tj MacIas, Kansas City Star, 9 June 2025
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Adjective
Paulla King/Paulla King Violet currently weighs just 41.8 pounds—estimated to be 20 to 30 pounds underweight.
—Lydia Patrick, MSNBC Newsweek, 3 July 2025
His tire management mastery won the 2024 Belgian GP before Russell was ultimately disqualified for his car being underweight.
—Alex Kalinauckas, New York Times, 20 June 2025
But there were also broader losses in reading and math proficiency, lower preschool enrollment and a higher rate of babies born underweight.
—Laura Tillman, Hartford Courant, 12 June 2025
Found as a stray last August, Gilly was dangerously underweight and had clearly been through a lot.
—Tj MacIas, Kansas City Star, 9 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 9 Jul. 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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