eally 是副词（adv.）.
词条如下：
really
副词 ad.
1.
真地,确实,实际上
Did she really say that?
她真的那么说了?
2.
很,十分,全然
It's really cold today.
今天很冷.
3.
(用以加强语气)实在,其实
You ought really to have asked me first,you know.
要知道,你本应先问一问我的.
4.
(表示疑问、惊讶、恼怒等)真的;是吗;真是的
Well,really!You needn't have said that.
咳,真是的!你当时实在没有必要那么说.