生病讓腦子鬆掉
這是繩子鬆掉最原本的原因：身體病了，腦子跟著失去準頭。
adjective · C1
So ill that your mind is not clear, so that you talk on and on in an excited or worried way and say things that do not fit what is around you.
神智不清、說胡話
核心畫面
Think of a mind that has slipped its rope. The person is still talking, still moving, but nothing is being held back and nothing quite matches the room. A fever can that rope, and so can news too good to take in. Delirious names the loose state itself, and leaves the cause to the words around it.
delirious 可以想成一顆繩子鬆掉的腦袋。人還在講話，還在動，可是沒有東西被收著，講的內容也跟現場對不太上。讓…更多收起
delirious 可以想成一顆繩子鬆掉的腦袋。人還在講話，還在動，可是沒有東西被收著，講的內容也跟現場對不太上。讓繩子鬆掉的可能是一場高燒，也可能是一個太好、一時收不下的消息。這個字說的是那個「鬆掉」的狀態本身，至於是什麼把繩子弄鬆的，交給旁邊的字去講。From the word’s history
Wiktionary gives the word as delirium plus the adjective ending -ous, and points to Latin delirus, meaning silly or crazy. So the adjective simply names a person who is inside the state called delirium.
維基詞典說這個字是 delirium 加上形容詞字尾 -ous 組成的，並提到拉丁文的 delirus（糊塗、發昏）。所以它的意思就寫在形狀裡：處在 delirium 這個狀態裡的人。先認得名詞 delirium，形容詞就不用另外背。
Wiktionary (kaikki extract, etymology_text supplied in this packet: kaikki:3f6f69a190036ae4:370154550)
Two branches
快樂讓腦子鬆掉
同一條鬆掉的繩子，換一個原因：這次讓人收不住的不是病，是太大的高興。
adjective · C1
So excited or so happy that you almost cannot control yourself.
欣喜若狂