形容詞 needful:

1. necessary for relief or supply
   同義詞：needed, required, requisite

1. Air and water are needful for living things.
   空氣和水封生物是不可缺的東西。
2. Sister handed Peter the rubbish bin and said, "go and do the needful."
   姐姐把垃圾桶遞給彼得，說：“干你的活兒去吧?！?/div>
3. The baby's crying; I'd better go and do the needful.
   孩子哭了，我最好還是去看看要做些什麼。
4. You should do what is needful as soon as possible.
   你應該盡快做必須做的事。

need.ful

adj.（形容詞）
Necessary; required.See Synonyms at indispensable
必要的；必需的參見 indispensable

【引伸】
need.fully
adv.（副詞）
need.fulness
n.（名詞）