unprepossessing
US /ˌʌn.priː.pəˈzes.ɪŋ/
UK /ˌʌn.priː.pəˈzes.ɪŋ/

1.
poco attraente, sgradevole
not attractive or appealing to the eye
:
•
The old house was rather unprepossessing from the outside.
La vecchia casa era piuttosto poco attraente dall'esterno.
•
Despite his unprepossessing appearance, he was a brilliant scientist.
Nonostante il suo aspetto poco attraente, era uno scienziato brillante.