ill-defined
US /ˌɪlˈdɪfaɪnd/
UK /ˌɪlˈdɪfaɪnd/

1.
mal definido, indefinido
not clearly or sharply defined or delineated
:
•
The boundaries of the property were ill-defined.
Os limites da propriedade eram mal definidos.
•
His role in the project was ill-defined, leading to confusion.
Seu papel no projeto era mal definido, levando à confusão.