動詞 decide:

1. reach, make, or come to a decision about something
   同義詞：decide, make up one's mind, determine
2. bring to an end; settle conclusively
   同義詞：decide, settle, resolve, adjudicate
3. cause to decide
   同義詞：decide
4. influence or determine
   同義詞：decide

形容詞 decided:

1. recognizable; marked
   同義詞：distinct

1. We decided to delay our wedding until next year.
   我們決定把婚禮推遲到明年。
2. In the USA foreign policy is decided by the federal government and federal laws are made by Congress.
   美國外交政策取決于聯(lián)邦政府，聯(lián)邦法律由國會制定。
3. The farmer decided to leave the land fallow for a year.
   農(nóng)夫決定讓土地休耕一年。
4. I've decided to invest in a new car.
   我已決定買一輛新汽車。
5. We decided to advertise our new product.
   我們決定為我們的新產(chǎn)品做廣告。
6. The boys have decided to go camping next week.
   男孩子們已決定下個星期去露營。
7. I feel decidedly unwell this morning.
   我今天上午確實感到不舒服。

de.cid.ed

adj.（形容詞）
Without doubt or question; definite:
明白無誤的：確實無疑的或毫無問題的；明確的：
例句：
a decided success.
明顯的成功

Free from hesitation or vacillation; resolute.
堅定的：毫不猶豫的或毫不遲疑的；堅決的

【引伸】
decid.edly
adv.（副詞）
decid.edness
n.（名詞）