seriously

In 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.

Gravely; deeply; very much.

That was a seriously unpleasant thing to say.

Used to attempt to introduce a serious point in a less serious conversation.

Now, seriously, why did you forget to feed the cat today?

Used to call back to a previous point, in disbelief or for emphasis.

You baked ten (10) cakes. Seriously, why did you do that?

In an extreme or major way; majorly.

Unless you're seriously strapped (armed), you're about to be not okay too.