un·der·weight /ˌʌndɚ/
  重量不足(a.)重量不足的
  un·der·weight /-ˈwet/ 形容詞
  體重過輕
  underweight
       adj : having unattractive thinness; "a child with skinny freckled
             legs"; "a long scrawny neck" [syn: scraggy, scrawny,
              skinny, weedy]