In a way or manner that is real, not unreal.

(modal) Actually; in fact; in reality.

“"He really is a true friend." / "Really? What makes you so sure?"”

(as an intensifier) Very (modifying an adjective); very much (modifying a verb).

“But ma, I really, really want to go to the show!”

Indicating surprise at, or requesting confirmation of, some new information; to express skepticism.

“A: He won the Nobel Prize yesterday.”

(sarcastic, typically exaggerated question.) Indicating that what was just said was obvious and unnecessary; contrived incredulity

“A: I've just been reading Shakespeare - he's one of the best authors like, ever!”

Indicating affirmation, agreement.

“A: That girl talks about herself way too much.”