uninformative

/ˌʌnɪnˈfɔːrmətɪv/
adjective
  1. Providing little or no useful information; not helpful in explaining or clarifying something.
    • The lecture was so uninformative that most students left early.
    • His uninformative reply did not help us understand the problem.
    • The website's FAQ section was uninformative and left many questions unanswered.