underweight
US /ˌʌn.dɚˈweɪt/
UK /ˌʌn.dɚˈweɪt/

1.
ondergewicht, te licht
below a weight considered normal or healthy
:
•
The doctor said the baby was slightly underweight.
De dokter zei dat de baby licht ondergewicht had.
•
She was concerned about her dog being underweight.
Ze maakte zich zorgen dat haar hond ondergewicht had.