Unanswerable (adjective)

Not able to be answered or explained; impossible to refute or disprove.

Origin:

From the word answer meaning "to reply" and the prefix un- meaning "not".

Examples:

1. The question was unanswerable, as it had no clear answer.
2. The argument was unanswerable, leaving the opponent speechless.
3. The accusation was unanswerable, as the evidence was overwhelming.
4. The riddle was unanswerable, stumping the contestants.
5. The question of the meaning of life is unanswerable.