Not capable of being answered; unanswerable.(adjective)
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Use "answerless" in a sentence
"It is right now, every year, that I wonder what I'm doing, what we're doing, the answerless "what's it all about" questions that must occur to astronauts who have been in the space station too long."
"If you wink enough nobody will notice your answerless gestures, dog-gone-it!"
"Every now and then things seem brighter and someone waves their hand in front of my face to wake me up, but I keep ending up here burying myself in answerless questions."