The adv really has 4 senses (first 2 from tagged texts)
1. (61) truly, genuinely, really -- (in accordance with truth or fact or reality; "she was now truly American"; "a genuinely open society"; "they don't really listen to us")
2. (42) actually, really -- (in actual fact; "to be nominally but not actually independent"; "no one actually saw the shark"; "large meteorites actually come from the asteroid belt")
3. in truth, really, truly -- (in fact (used as intensifiers or sentence modifiers); "in truth, moral decay hastened the decline of the Roman Empire"; "really, you shouldn't have done it"; "a truly awful book")
4. very, really, real, rattling -- (used as intensifiers; `real' is sometimes used informally for `really'; `rattling' is informal; "she was very gifted"; "he played very well"; "a really enjoyable evening"; "I'm real sorry about it"; "a rattling good yarn")