unascertainable
/ˌʌnæsərˈteɪnəbəl/
adjective
- Impossible to find out or discover with certainty.
- The author's true identity is unascertainable from the surviving manuscripts.
- The exact cause of the ancient fire remains unascertainable due to lack of evidence.
- In many cold cases, the truth is unascertainable after so many years.
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