un·an·swer·able /ˌʌnˈæn(t)srəbəl, ˈæn(t)sə-/
(a.)無法回答的,沒有責任的
Un·an·swer·a·ble a. Not answerable; irrefutable; conclusive; decisive; as, he gave an unanswerable argument. -- Un*an*swer*a*ble*ness, n. -- Un*an*swer*a*bly, adv.
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unanswerable
adj : impossible to answer; "an unanswerable argument"