incapable

形容词 incapable:

1. (followed by `of') lacking capacity or ability
2. not being susceptible to or admitting of something (usually followed by `of')
3. lacking the necessary skill or knowledge etc.
   同义词：unqualified
4. (followed by `of') not having the temperament or inclination for
5. not meeting requirements
   同义词：incompetent, unequal to

1. Incapable of being expressed; indescribable or unutterable.
   不可言喻的难以表达的; 难以描叙的
2. That child seems incapable of keeping out of (ie not getting into) mischief.
   那个孩子不调皮捣蛋简直就受不了。
3. As a lawyer she's totally incapable.
   她当律师完全不合格。
4. The children seem to be totally incapable of working quietly by themselves.
   这些孩子似乎完全不能安静地自己做功课。

in.ca.pa.ble

adj.（形容词）

Lacking the necessary ability, capacity, or power:
无能的; 没用的：缺乏必需的能力、容量或权力的：
例句：
incapable of carrying a tune; incapable of love.
无法唱得合拍；不能爱

Unable to perform adequately; incompetent:
不胜任的：不能充分履行的；无能的：
例句：
an incapable administrator.
一个不胜任的行政长官

Not admitting or permitting; not susceptible:
不容许的; 无法做的：不容许或不被接受的；不受影响的：
例句：
a unique feat, incapable of duplication.
无法模拟的独门绝活

Law Lacking legal qualifications or requirements; ineligible.
【法律】 无资格的：法律上无资格或不合要求的；不合法的

【引伸】
inca.pabil.ity 或
inca.pableness
n.（名词）
inca.pably
adv.（副词）