unilluminating

/ˌʌnɪˈluːmɪneɪtɪŋ/
adjective
  1. Failing to provide useful information, insight, or understanding; not enlightening.
    • His answer to my question was brief and unilluminating.
    • The lecture was so unilluminating that most students fell asleep.
    • I read the report twice, but found it completely unilluminating.
What does "unilluminating" mean? | whatsthatwordmean | whatsthatwordmean