Word family noun weight weights weighting adjective overweight ≠ underweight weighted weighty weightless verb weigh outweigh weight
From Longman Dictionary of Contemporary Englishunderweightun‧der‧weight /ˌʌndəˈweɪt◂ $ -ər-/ adjective MITHIN PERSONweighing less than is expected or usual OPP overweight Women who smoke risk giving birth to underweight babies.► see thesaurus at thinExamples from the Corpus
underweight• The doctor says that I'm underweight and has put me on a special diet.• Half the under-fives are underweight, and nearly 500,000 die each year.• The child is born seriously underweight, and underweight babies can not catch up with large ones.• Women who consume large amounts of caffeine are more likely to give birth to underweight babies.• a premature, underweight baby• The Lancet medical journal reports that children who were underweight before the operation had a growth spurt afterwards.• Additional penalties A paddler at a Nottingham regatta this year will receive a 1 point penalty for paddling with an underweight boat.• Besides, I was always underweight for football and just right for basketball and everything else I played.• If you are very underweight, see your doctor.• According to all these charts I am underweight, sometimes by as much as two stone.From Longman Business Dictionaryunderweightun‧der‧weight /ˌʌndəˈweɪt◂-ər-/ adjective FINANCE used to show that an investor has less of a particular investment than usual, or less of it than they should haveInvestors would be wise to be underweight in the German banking and retailing sectors at the moment. —underweight verb [transitive] 