This is the 659th most frequent Italian word.
anzi
"Anzi" means "on the contrary," "actually," or "better yet," depending on context.
Here, 'anzi' is used to denote a contradiction or correction to what might be previously assumed.
Non è difficile, anzi è molto facile.
It is not difficult, on the contrary, it is very easy.
In this case, 'anzi' is utilized to refine or amend a previous statement.
Vieni a trovarmi domani, anzi meglio nel pomeriggio.
Come visit me tomorrow, or rather, better in the afternoon.
Here, 'anzi' emphasizes a stronger reinforcement of the preceding statement, contrasting the expectation.