If you are incapable of something, you cannot do it — not “I failed this once,” but “this is not in me,” or “this thing simply cannot happen.” English almost always wants incapable of + a noun or -ing: incapable of swimming, incapable of telling the truth, incapable of running the new software.

If you are如果你 incapable of something對某件事沒有能力 you cannot do it就是辦不到 — not不是 "I failed this once,"「這次失敗了」 but而是 "this is not in me,"「我天生就辦不到」 or或是 "this thing simply cannot happen."「這件事根本不可能發生」 English英文 almost always幾乎都 wants incapable of + a noun or -ing用 incapable of 接名詞或 -ing incapable of swimming（不會游泳）、 incapable of telling the truth（沒辦法說實話）、 incapable of running the new software（跑不動新軟體）都是這樣用

Though actually, it is a rather heavy, formal word. Friends more often say can’t or not able to; we reach for incapable when the inability feels complete, built-in, or slightly judging.

Though actually不過 it is是 a rather heavy, formal word一個相當正式、有份量的字 — friends朋友之間 more often say can't or not able to比較常說 can't 或 not able to we reach for incapable我們會選 incapable when the inability feels complete, built-in, or slightly judging是在講那種完全做不到、天生如此、或帶點評判意味的情況

About people it can sound cold: calling someone incapable at work often means you think they are useless, not just stuck on one task.

About people用在人身上 it can sound cold聽起來會有點冷酷 calling someone incapable at work說某人在工作上 incapable often means you think they are useless往往代表你覺得他沒用 not just stuck on one task不只是這件事做不好而已

About machines and systems it is calmer: a phone incapable of 5G.

About machines and systems用在機器和系統上 it is calmer語氣就溫和多了 a phone incapable of 5G像是一支不支援 5G 的手機

In official and legal writing it can mean a person cannot, in the eyes of the law, manage their own affairs.

In official and legal writing在官方和法律文件裡 it can mean a person cannot, in the eyes of the law, manage their own affairs可以指一個人在法律上被認定無行為能力、無法自理事務

The opposite is capable. Do not pair it with to do.

The opposite反義詞 is capable是 capable — do not pair it with to do但不要接 to do 使用