really
(literal) In a way or manner that is real, not unreal.
(modal) Actually; in fact; in reality.
(as an intensifier) Very (modifying an adjective); very much (modifying a verb).
(informal) Indicating surprise at, or requesting confirmation of, some new information; to express skepticism.
(by extension) A phatic confirmation by a listener, to signal active listening; mostly devoid of literal meaning, with the phatically contrived incredulity being merely formulaic.
(sarcastic, typically exaggerated question.) Indicating that what was just said was obvious and unnecessary; contrived incredulity
(US) Indicating affirmation, agreement.
(informal) Indicating displeasure at another person's behaviour or statement.
(re-ally)