re·al·ly 
/ˈri:jəli/ adverb
/ˈri:jəli/ adverb 1 — used to refer to what is true or real ▪ She didn't really mean it. ▪ Is that really a word? ▪ It turned out that the bone wasn't really broken. ▪ He might really be the one she's going to marry. ▪ They really are twins. ▪ What really happened? ▪ There are really only two choices. ▪ Who really cares? ▪ I'm not hurt—really. [=I am being honest when I say I'm not hurt] ▪ Did you really [=honestly] think I wouldn't notice? 2 : without question or doubt — used to make a statement more definite or forceful ▪ You should really see a doctor about your back pains. ▪ I really believe she's not coming back. ▪ You really should try some of this cake. ▪ She really is a nice person. ▪ We really need the extra money. ▪ He really likes her. [=he likes her very much] 3 : to a great degree : very
▪ The dog runs really fast. ▪ The water is really hot/cold. ▪ She's a really nice person. ▪ It's a really [=truly] beautiful day. ▪ a really frightening/funny story ▪ I had a really good time at the party. 4 — used to reduce the force of a negative statement ▪ I don't really agree with you. ▪ It really doesn't matter. 5 — used in speech to show surprise, doubt, or interest ▪ “They're getting divorced.” “Really?” [=I am surprised to hear that and would like to hear more] ▪ “I think she likes me.” “Oh, really?” [=I am doubtful that she really likes you] 6 US — used in speech to express agreement with what someone has just said ▪ “He shouldn't be allowed to do that.” “Yeah, really. Who does he think he is?” 7 — used in speech to show that you are annoyed ▪ Really, you could have mentioned it sooner. ▪ Really, you're being ridiculous.
▪ The dog runs really fast. ▪ The water is really hot/cold. ▪ She's a really nice person. ▪ It's a really [=truly] beautiful day. ▪ a really frightening/funny story ▪ I had a really good time at the party.
not really
— used to say “no” in a way that is not very forceful or definite ▪ “Was the movie good?” “Not really.” [=the movie wasn't very good] ▪ “Do you want to go to a movie?” “No, not really.” [=no, I am not very interested in going]
