incapable
/ɪnˈkeɪpəbl; ɪn`kepəbl/ adj
1 [pred 作表语]
~ of sth/doing sth not able to do sth 不能做某事
The children seem to be totally incapable of working quietly by themselves. 这些孩子简直完全不能静静地自己做功课.
incapable of telling a lie, ie too honest to do so 不会说谎（极诚实而不说谎）
incapable of sympathy 不能同情人.
2 unable to do anything well; helpless; not capable 什麽事都做不好的; 不能胜任的; 无能的
As a lawyer she's totally incapable. 她当律师完全不合格.
3 (idm 习语) drunk and incapable => drunk.