unknowable

/ˌʌnˈnoʊəbəl/
adjective
  1. Impossible to know, understand, or discover.
    • Some questions about the past are unknowable without more evidence.
    • To her, his true feelings remained unknowable.
    • The exact number of stars in the galaxy is unknowable.
Antonyms
What does "unknowable" mean? | whatsthatwordmean | whatsthatwordmean