1
a decided + noun
此处的 decided 意为“明确的、显而易见的”，通常放在名词前作定语。
There has been a decided change in his attitude.
他的态度发生了明显的变化。
坚决的；果断的
先理解核心含义，再看它在真实句子里的用法。
坚决的；果断的
Determined; resolute.
There has been a decided change in his attitude.
他的态度发生了明显的变化。
坚定的,果断的
Determined; resolute.
明确的,确定无疑的
Clear; unmistakable, definite, unquestionable.
He has a decided advantage in the competition.
他在比赛中具有明显的优势。
She was decided in her refusal to accept the offer.
她坚决拒绝接受这个提议。
There is a decided improvement in his health since the treatment.
治疗后，他的健康状况有了明显的改善。
此处的 decided 意为“明确的、显而易见的”，通常放在名词前作定语。
There has been a decided change in his attitude.
他的态度发生了明显的变化。
此结构表示“对某事态度坚决、有明确想法”，主语通常为人。
She is very decided about leaving the company.
她对离开公司这件事非常坚决。
该结构强调在某方面表现得坚定、果断，后面接表示行为或态度的名词。
He was decided in his refusal to negotiate.
他坚决拒绝谈判。
Not this
Our manager is very decided, so she always picks the best option quickly.
Use this
Our manager is very decisive, so she always picks the best option quickly.
decided 的“果断”侧重态度坚定、不犹豫，不强调决策速度；decisive 才表示“善于迅速做出决定”。句中 quickly 强调速度，所以应用 decisive。
Not this
He was decided upset by the news.
Use this
He was decidedly upset by the news.
decided 是形容词，不能修饰形容词 upset；修饰形容词或动词要用副词 decidedly，表示“明确地、无疑地”。
Not this
She is decided to study abroad.
Use this
She is determined to study abroad.
decided 作形容词时表示“坚定的、明确的”，但不接不定式作补足语；表示“下决心做某事”应用 be determined to do，或改说 have decided to do。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
明显的优势
Her experience gave her a decided advantage in the interview.
她的经验使她在面试中占有明显的优势。
显著的改进
There has been a decided improvement in his health.
他的健康状况有了显著的好转。
明显的变化
We noticed a decided change in her attitude.
我们注意到她的态度发生了明显的变化。
明显的差别
There is a decided difference between the two plans.
这两个方案之间有明显的差别。
明确的偏好
She has a decided preference for classical music.
她对古典音乐有明确的偏好。
明确的看法
He has a decided opinion on the matter.
他对这件事有明确的看法。
我决定坚持爱。仇恨是难以承受的沉重负担。
She has very decided views on the subject.
她在这个问题上有非常坚定的看法。
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decided 来自 decide“已下决定”：已下决心的人自然坚定果断；事情已定局，当然明确无疑。
语域：formal 常见场景：formal writing、news reports、official statements decided 作形容词表示“明确的；坚定的”时，多用于正式写作或较严肃的场合；日常口语中更常用 definite、determined 等词。具体语域需结合语境判断。
通常作表语，表示坚定决心
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