indeterminable

/ˌɪndɪˈtɜːrmɪnəbəl/
adjective
  1. Impossible to decide, discover, or calculate exactly.
    • The exact cause of the fire was indeterminable due to the damage.
    • Whether the plan will succeed is indeterminable at this point.
    • The age of the ancient artifact is indeterminable with current technology.
Synonyms
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