English definition of “really”
VERY › very or very much: She's really nice. I really don't want to go. That's really interesting. "Did you like it then?" "Er, not really" (= no).
TRUTH › used when you are saying what is the truth of a situation: She tried to hide what she was really thinking. They didn't really say anything important.
Really? › used when you are surprised at what someone has just said: "Apparently, he's leaving." "Really?"