1. 词性特征：
-- decided：主要作形容词（原形为decide的过去分词转化而来）
-- decisive：纯形容词
2. 核心语义差异：
-- decided 强调"明确的、不容置疑的"
(例) a decided advantage 明显的优势
(例) She gave me a decided nod. 她给了我明确的点头示意
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word-vs-word-cn
【Decided】 , 【decisive】 are often confused, especially when they mean positive and leaving no room for doubt, uncertainty, or further discussion.
In this sense the words are applied chiefly to persons, their natures, their utterances or manner of utterance, their opinions, or their choices.
【Decided】 implies a contrast with what is undetermined, indefinite, and neither this nor that; thus, a 【decided】 blue raises no question of its greenness or blackness; a 【decided】 success so far overpasses the line between success and failure that no one can question its favorable termination; a 【decided】 answer leaves no doubt of a person's meaning, wishes, or intentions.
When applied to a person's character, expression, or movements 【decided】 suggests such qualities or outward signs of qualities as determination, resolution, and lack of all hesitation or vacillation.
【Decisive】 , on the other hand, implies an opposition to what is unsettled, uncertain, or wavering between this and that (for this sense as applied to things see CONCLUSIVE).
When used in reference to persons it implies ability or intent to settle or success in settling a controverted matter once and for all.
