unanswerable[adjective]Synonyms: conclusive, absolute, incontestable, incontrovertible, indisputable
[TahlilGaran] English Synonym Dictionary ▲
un‧an‧swer‧a‧ble /ʌnˈɑːns
ərəb
əl $ ʌnˈæn-/
adjective1. an unanswerable question is one that cannot be answered
2. definitely true and therefore impossible to argue against:
The case (=reasons for doing something) for better public transport is unanswerable. [TahlilGaran] Dictionary of Contemporary English ▲