undeterminable

/ˌʌndɪˈtɜːrmɪnəbəl/
adjective
  1. Impossible to decide, identify, or calculate with certainty.
    • Whether the painting is genuine or a forgery remains undeterminable.
    • The age of the ancient artifact is undeterminable with current technology.
    • The exact cause of the fire is undeterminable due to the damage.
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