: 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
Sun Sentinel Editorial Board, Sun Sentinel, 27 Apr. 2026
Yet, SigRist says the NC pension system remains generally underweight the sector relative to benchmark.
—Amanda Gerut, Fortune, 7 Mar. 2026
A lot of them were very underweight, especially the adults.
—Jt Moodee Lockman, CBS News, 26 Feb. 2026
And a Deutsche Bank measure of discretionary equity positioning is now underweight, according to Parag Thatte, a strategist at the bank.
—Geoffrey Morgan, Bloomberg, 24 Feb. 2026
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Adjective
My five-year-old daughter was born underweight, probably because both parents were smokers.
—Sun Sentinel Editorial Board, Sun Sentinel, 27 Apr. 2026
Yet, SigRist says the NC pension system remains generally underweight the sector relative to benchmark.
—Amanda Gerut, Fortune, 7 Mar. 2026
A lot of them were very underweight, especially the adults.
—Jt Moodee Lockman, CBS News, 26 Feb. 2026
And a Deutsche Bank measure of discretionary equity positioning is now underweight, according to Parag Thatte, a strategist at the bank.
—Geoffrey Morgan, Bloomberg, 24 Feb. 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 1 May. 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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