incognoscible

/ˌɪnkɑɡˈnɑsəbəl/
adjective
  1. Impossible to know or understand; unknowable.
    • The true nature of the universe was once considered incognoscible.
    • Some mysteries of the deep ocean remain incognoscible to science.
    • To the ancient philosophers, the mind of God was incognoscible.
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