unanswerable (adj.)

• absolute
• actual
• chartered
• confirmable
• demonstrable
• excused
• exempt
• factual
• favored
• historical
• immune
• incontestable
• incontrovertible
• indisputable
• indubitable
• irrefutable
• irresponsible
• licensed
• privileged
• provable
• real
• released
• self-evident
• testable
• unaccountable
• undeniable
• unimpeachable
• unquestionable
• verifiable