This is the 2148th most frequent Turkish word.
gerçekten
"Really" or "truly."
Here, 'gerçekten' emphasizes the sincerity of the speaker about the greatness of the day.
Gerçekten harika bir gün!
This is truly a wonderful day!
'Gerçekten' is used to express surprise or to ask for confirmation.
Gerçekten mi? İnanamıyorum.
Really? I can't believe it.
In this context, 'gerçekten' intensifies the expression 'liked' to show genuine feeling.