ill defined

نامعلوم، نامشخص، مبهم، بدون وضوح، نامعین , تعریف نشده، تعیین نشده.
not easy to see or understand, unclear, vague, blurred, indictinct
If you describe something as ill - defined, you mean that its exact nature or extent is not as clear as it should be or could be.

. . . staff with ill - defined responsibilities.

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