In actuality (6)
'in actuality' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for really that I've seen before include "are you sure?" , "Actually, in fact" , "Go on" , "without a doubt" , "In truth - one may be surprised to say it" .)
(Other definitions for de facto that I've seen before include "Really" , "In reality, actual" , "Actual, though maybe not legal" , "Actual, not legal (situation)" , "In fact (Latin)" .)
'in actuality' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for truly that I've seen before include "Genuinely, properly" , "Really, genuinely" , "Verily" , "with accuracy" , "In reality" .)