To a low degree, not particularly, not especially. / Not actually (a hypothetical will not, in fact, come to pass), often rhetorical.

present participle of really

really; seriously; used to attempt to introduce a serious point in a less serious conversation

no kidding!; is that so? (sometimes used sarcastically in response to the obvious)

Alternative form of re-ally

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

very

simple past tense and past participle of really

Third-person singular simple present indicative form of really

Used other than figuratively or idiomatically: see oh, really. / (colloquial) An exclamation of surprise or amazement. / (colloquial, sarcastic) Said in response to an obvious statement.