Adieu is a French word for goodbye that English borrowed long ago. It is not an ordinary goodbye. It carries the feeling of a serious parting — one that might last a long time, or forever — and it sounds either literary or playful, depending on who says it and how.

Adieu is a French word for goodbyeAdieu是法文裡表示「再見」的字 that English borrowed long ago英文很久以前跟法文借來用. It is not an ordinary goodbye但它不是普通的「再見」. It carries the feeling of a serious parting它帶著一種鄭重道別的感覺 — one that might last a long time, or forever這種離別可能會很久，甚至是永遠 — and it sounds either literary or playful而且聽起來可能很文學，也可能很俏皮, depending on who says it and how要看是誰用什麼方式說的

You will meet it in three places. In old books and poetry, where it is sincere. In the fixed phrase 'without further adieu' — though careful writers say that phrase is really 'without further ado', a different word entirely, and the mix-up is so common now that you will see both. And in joking, slightly theatrical use among friends: someone leaves the room, waves, and says 'adieu!' with a smile.

You will meet it in three places你會在三種地方遇到它. In old books and poetry在老書和詩裡, where it is sincere用得很真摯. In the fixed phrase 'without further adieu'在固定的片語「without further adieu」裡 — though careful writers say that phrase is really 'without further ado'不過講究的作家會說這個片語其實應該是「without further ado」, a different word entirely（ado）是完全不同的一個字, and the mix-up is so common now that you will see both而現在這種混用太常見，兩種你都會看到. And in joking, slightly theatrical use among friends還有朋友之間開玩笑、帶點戲劇性的用法: someone leaves the room, waves, and says 'adieu!' with a smile像是有人離開房間，揮揮手，笑著說一聲「adieu!」

It is also a noun: 'to bid someone adieu' means to say goodbye to them, and 'she made her adieus' means she said her goodbyes. That noun use is old-fashioned and mostly literary.

It is also a noun它也可以當名詞: 'to bid someone adieu' means to say goodbye to them「to bid someone adieu」意思是跟某人道別, and 'she made her adieus' means she said her goodbyes「she made her adieus」意思是她說了再見. That noun use is old-fashioned and mostly literary這種名詞用法很老派，多半只出現在文學裡

How to say it: roughly 'a-DYOO' or 'a-DOO' in English. The plural, if you ever need it, is adieus or adieux, both accepted.

How to say it這個字怎麼唸: roughly 'a-DYOO' or 'a-DOO' in English大概唸成「a-DYOO」或「a-DOO」. The plural, if you ever need it如果你真的需要複數, is adieus or adieux是adieus或adieux, both accepted兩種都可以

Though actually — the real weight of the word is in what it once meant. It is a short form of a French phrase meaning 'I commend you to God' — the sort of thing you said when someone rode away and you were not sure you would see them again. That is why it still sounds heavier than 'bye', even to people who do not know the history.

Though actually不過事實上 — the real weight of the word is in what it once meant這個字真正的份量在於它以前的意思. It is a short form of a French phrase meaning 'I commend you to God'它是法文片語「I commend you to God」（我把你託付給上帝）的縮短形式 — the sort of thing you said when someone rode away就是有人騎馬離開時你會說的那種話 and you were not sure you would see them again那時你不確定還能不能再見到他們. That is why it still sounds heavier than 'bye'這就是為什麼它聽起來還是比「bye」沉重, even to people who do not know the history就算是不知道這段歷史的人也感覺得到