frumpy
US /ˈfrʌm.pi/
UK /ˈfrʌm.pi/

1.
ringard, vieillot, mal fagoté
unfashionable and dowdy in appearance
:
•
She felt a bit frumpy in her old sweater.
Elle se sentait un peu ringarde dans son vieux pull.
•
The dress made her look frumpy and shapeless.
La robe la faisait paraître vieillotte et informe.