unanswerable
🇺🇸
/ʌnˈænsərəbl/
🇬🇧
/ʌnˈɑːnsərəbl/
A question or argument that cannot be answered or disputed.
The mystery left everyone with an unanswerable question about what really happened.
A question that has no answer or cannot be answered.
The riddle was so complex that it seemed unanswerable.