underweight

US /ˌʌn.dɚˈweɪt/
UK /ˌʌn.dɚˈweɪt/
"underweight" picture
1.

體重不足的, 過輕的

below a weight considered normal or healthy

:
The doctor said the baby was slightly underweight.
醫生說嬰兒有點體重不足
She was concerned about her dog being underweight.
她擔心她的狗體重不足