程度嚴重
把那份重量放到程度上：不是講態度，而是講事情有多嚴重——嚴重到不能等閒看待。所以它多半配著不好的事出現。
seriously, very much · r · A2
very much, or to a large degree — used most often when something is bad or worrying.
嚴重地；非常
核心畫面
Picture the moment the smiling stops: whatever is being said or done now carries weight, so it is not to be laughed off. That weight is what the adverb adds. Point it at a manner and you get 'not joking'; point it at a degree and you get 'badly, to a worrying extent'; put it in front of a sentence and it warns the listener that the joking part is over.
可以想成：笑容收起來的那一刻——現在講的、做的這件事有份量，不能當笑話帶過。這個副詞加上去的就是那份重量。把它指向做…更多收起
可以想成：笑容收起來的那一刻——現在講的、做的這件事有份量，不能當笑話帶過。這個副詞加上去的就是那份重量。把它指向做事的態度，得到的是「不是在開玩笑」；指向程度，得到的是「嚴重到讓人擔心」；放在一句話前面，它等於先提醒對方：玩笑到此為止。From the picture
把某人某事當一回事
這一支把重量交給你去衡量別人或別的事：你認定它有份量，所以願意花注意力在上面。
take somebody/something seriously · r · B1
used in “take someone or something seriously” — to treat them as important and worth your attention.
把…當真；認真看待
Also in this word
seriously, not joking · r · B1
in a way that shows you are not joking, because the thing you are talking about or doing matters.
認真地；正經地
seriously, (not a joke) · r · A2
said before what you want to say, to show that this part is not a joke.
說真的；不開玩笑
seriously? checking · r · A2
said on its own as a question, to check that someone really means what they just said.
真的嗎？
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
seriouslyadv/ˈsɪə.ɹi.əs.li/
- 1
mannerIn a serious or literal manner.
- He was hoping that we would take him seriously.
- Jimmy jokingly called Bob a doofus. Bob took the insult seriously.
- 2
Gravely; deeply; very much.
- That was a seriously unpleasant thing to say.
- 3
Used to attempt to introduce a serious point in a less serious conversation.
- Now, seriously, why did you forget to feed the cat today?
- 4
Used to call back to a previous point, in disbelief or for emphasis.
- You baked ten (10) cakes. Seriously, why did you do that?
- 5
informalIn an extreme or major way; majorly.
- Unless you're seriously strapped (armed), you're about to be not okay too.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。