as in lightweight
having little weight
the long illness left him frail and underweight
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Recent Examples of underweight
Radiographs showed no broken bones or major injuries, though veterinarians noted the cub was underweight and had a small laceration on her front paw, according to Cort Klopping, a spokesperson for the California Department of Fish and Wildlife.
—
Aidin Vaziri, San Francisco Chronicle, 30 Jan. 2026
One was a listless, underweight female goat with no appetite.
—Nicole Blanchard, Idaho Statesman, 23 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
Consider These Questions Moreau cautions that short-term fasting is not for everyone, and people with medical conditions, or those who are underweight or prone to disordered eating should consult a clinician before making dietary changes.
—Tom Gavin, EverydayHealth.com, 11 Nov. 2025
See All Example Sentences for underweight
Aidin Vaziri, San Francisco Chronicle, 30 Jan. 2026
One was a listless, underweight female goat with no appetite.
—Nicole Blanchard, Idaho Statesman, 23 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
Consider These Questions Moreau cautions that short-term fasting is not for everyone, and people with medical conditions, or those who are underweight or prone to disordered eating should consult a clinician before making dietary changes.
—Tom Gavin, EverydayHealth.com, 11 Nov. 2025
See All Example Sentences for underweight
Recent Examples of Synonyms for underweight
lightweight
Adjective
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This two-piece set is made from polyester but has a soft texture that feels like a comfy, lightweight sweater.—
Alicia Geigel,
Southern Living,
17 Apr. 2026
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One of Glow Recipe’s original bestsellers, this oil-free moisturizer uses watermelon extract and plenty of antioxidants in a lightweight gel great for daily use by those with oily skin.—
BestReviews,
Mercury News,
16 Apr. 2026
Cite this Entry
“Underweight.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underweight. Accessed 19 Apr. 2026.
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