Ill-defined (adjective)

1. Having been stated or explained in a poor or unclear manner.
2. Having a lack of clear boundaries or distinctness.

Origin:

Compound of "ill" meaning bad or incorrect and "defined" meaning clearly stated or explained.

Examples:

1. The concept was ill-defined and difficult to understand.
2. The rules were ill-defined and open to interpretation.
3. The project was ill-defined, with no clear goals or objectives.
4. The boundaries of the territory were ill-defined, leading to disputes.
5. The ill-defined regulations caused confusion among the employees.