沒有模糊地帶
兩個意思都從「已經定案」這個畫面長出來，差別只在定案的是事情的樣子，還是人的心意。
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Used before an adjective or an adverb to say that something is true in a clear, obvious way, and often that it is clearly more so than something else.
明顯地
核心畫面
You can think of decidedly as the feeling of a matter that has already been settled. Once something is decided, there is no room left for maybe. That settled feeling then lands in two places: on the thing itself, which is clear enough to point at, and on a person, who has finished thinking and will not reopen the question.
decidedly 的畫面可以想成「事情已經拍板」。一旦定案，就沒有「大概」「也許」的空間。這種沒有模糊地帶的感覺，…更多收起
decidedly 的畫面可以想成「事情已經拍板」。一旦定案，就沒有「大概」「也許」的空間。這種沒有模糊地帶的感覺，剛好可以放到兩個地方。一個是事情本身的樣子：它清楚到你可以伸手指出來。一個是人的口氣：話說完了，不打算再討論。From the word’s history
Decidedly is decided plus the adverb ending -ly, so the word carries the picture of something already decided.
decidedly 由 decided（已經定下來的）加上 -ly 構成，所以它天生就帶著「已經定案」的畫面。
Wiktionary entry 'decidedly' (packet source_ref kaikki:3f6f69a190036ae4:1025713273): 'From decided + -ly.'
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