really
adverb
1 although he lived in a derelict house, he was really very wealthy:
in fact, in actual fact, actually, in reality, in point of fact, as a matter of fact, in truth, if truth be told, to tell the truth, in actuality;
archaic in sooth.
2 he really likes her | I really appreciate what you've done:
genuinely, truly, honestly;
undoubtedly, without a doubt, indubitably, certainly, surely, assuredly, unquestionably, undeniably;
indeed;
archaic verily.
3 I bet this place is really spooky late at night | they were really kind to me:
very, extremely, thoroughly, decidedly, awfully, terribly, frightfully, dreadfully, fearfully, exceptionally, exceedingly, immensely, uncommonly, remarkably, eminently, extraordinarily, most, positively, downright;
heartily;
Scottish unco;
North American quite;
French très;
informal terrifically, tremendously, right, devilishly, ultra, too … for words, mucho, mega, seriously, majorly, oh-so, stinking;
British, informal jolly, ever so, dead, well, fair;
North American, informal real, mighty, awful, plumb, powerful, way, bitching;
South African, informal lekker;
informal , dated devilish;
archaic exceeding, sore.
really Oxford Dictionary of English