unable/ʌnˈeɪbl; ʌn`ebl/ adj[pred 作表语]~ to do sth (esp fml 尤作文雅语) not having the ability, opportunity or authority to do sth 没有做某事的能力、 机会或权力 She is unable to walk. 她不能行走. I tried to contact him but was unable to. 我竭力想与他联系, 但是没联系上.
牛津英汉双解词典