unenlightening

/ˌʌnɪnˈlaɪtənɪŋ/
adjective
  1. Failing to provide useful information, insight, or understanding; not educational.
    • The lecture was unenlightening, repeating facts everyone already knew.
    • She found the documentary unenlightening and turned it off halfway through.
    • His unenlightening response did nothing to answer the student's question.
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