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

1.
kurang berat badan, terlalu kurus
below a weight considered normal or healthy
:
•
The doctor said the baby was slightly underweight.
Doktor berkata bayi itu sedikit kurang berat badan.
•
She was concerned about her dog being underweight.
Dia bimbang anjingnya kurang berat badan.