ill-defined
US /ˌɪlˈdɪfaɪnd/
UK /ˌɪlˈdɪfaɪnd/

1.
不明确的, 模糊的
not clearly or sharply defined or delineated
:
•
The boundaries of the property were ill-defined.
财产的边界不明确。
•
His role in the project was ill-defined, leading to confusion.
他在项目中的角色不明确,导致了混乱。