ill-defined

US /ˌɪlˈdɪfaɪnd/
UK /ˌɪlˈdɪfaɪnd/
"ill-defined" picture
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。