無法回答的,沒有責任的
Unanswerable \Un*an"swer*a*ble\, a. Not answerable; irrefutable; conclusive; decisive; as, he have an unanswerable argument. -- {Un*an"swer*a*ble*ness}, n. -- {Un*an"swer*a*bly}, adv.
unanswerable adj : impossible to answer; "an unanswerable argument"