Undisclosed means not made public — the information exists, someone knows it, and they have chosen not to say. It is almost always used in front of a noun, and a small set of nouns at that: an undisclosed sum, an undisclosed amount, an undisclosed fee, an undisclosed location, an undisclosed source, undisclosed reasons.

Undisclosed未公開的 means not made public意思是沒有公開 — the information exists這個資訊是存在的, someone knows it有人知道, and they have chosen not to say但他們選擇不說。It is almost always used in front of a noun它幾乎都放在名詞前面, and a small set of nouns at that而且是一小群固定的名詞: an undisclosed sum, an undisclosed amount, an undisclosed fee, an undisclosed location, an undisclosed source, undisclosed reasons像 an undisclosed sum（未公開的金額）、an undisclosed amount、an undisclosed fee、an undisclosed location、an undisclosed source、undisclosed reasons 這些說法。

If you learn the phrase "for an undisclosed sum", you have learned most of this word — it is how news reports describe a company or a footballer being sold when nobody will say the price. This is the language of business pages, court reports, and press releases, not of conversation.

If you learn the phrase "for an undisclosed sum"如果你學會 "for an undisclosed sum" 這個片語, you have learned most of this word你就等於學會了這個詞的大部分用法 — it is how news reports describe a company or a footballer being sold when nobody will say the price這是新聞報導在描述公司或足球員被賣掉、卻沒人願意透露價格時的說法。This is the language of business pages, court reports, and press releases這是財經版、法庭報導、新聞稿的用語, not of conversation不是日常對話會用的。

What makes it useful, and worth noticing, is its neutrality. "Secret" and "hidden" both hint that someone is up to no good; undisclosed simply reports that the number was not given, and often the not-giving was perfectly normal and agreed by both sides.

What makes it useful, and worth noticing, is its neutrality這個詞有用、也值得注意的地方，在於它的中立。"Secret" and "hidden" both hint that someone is up to no good "secret" 和 "hidden" 都暗示有人在搞什麼不好的事; undisclosed simply reports that the number was not given undisclosed 只是單純陳述那個數字沒有被公開, and often the not-giving was perfectly normal and agreed by both sides而且通常這個「不公開」是很正常、雙方都同意的。

It even appears where a rule requires telling: "undisclosed conflicts of interest" means the person was supposed to disclose and did not — there the blame comes from the situation, not from the word itself. "Withheld" is its close cousin but sounds more deliberate and more suspicious.

It even appears where a rule requires telling它甚至會出現在規定必須告知的場合: "undisclosed conflicts of interest" means the person was supposed to disclose and did not "undisclosed conflicts of interest" 是指這個人本來應該要揭露卻沒有 — there the blame comes from the situation, not from the word itself在這種情況下，該被責怪的是那個情境，而不是這個詞本身。"Withheld" is its close cousin "withheld" 是它的近親 but sounds more deliberate and more suspicious但聽起來更刻意、也更可疑。