In strict usage adverbs of degree such as really, too, quite, very, and extremely are used only to qualify adjectives: How to use really in a sentence. The meaning of really is in reality :
Thomas Muller to snub MLS? Bayern Munich legend set to be offered Serie
Used to say that something is certain: See examples of really used in a sentence. In actual truth or fact:
Really synonyms, really pronunciation, really translation, english dictionary definition of really.