ill defined

/ˌɪl dɪˈfaɪnd/
adjective
  1. Not clearly described, explained, or understood; vague or ambiguous.
    • The project's goals were ill-defined, so the team struggled to make progress.
    • The boundaries of the park are ill-defined on this old map.
    • Her role in the company was ill-defined, leading to confusion about her responsibilities.
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