1) truly, of a truth, in reality, most certainly
Part of Speech: adverb
Adverb from G227; truly: - indeed, surely, of a surety, truly, of a (in) truth, verily, very.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἀληθῶς; click on the second column to search for that grammatical form of the root ἀληθῶς; click on the third column to search for that word and grammatical form; click on the total to search for the root ἀληθῶς.