Today's Parola del Giorno is the adjective, perseverante, which can mean persistent.
It can be used to describe a person who is persistent, in the sense of persevering:
See the the example below:
Il lavoro è difficile per Maria, ma è molto brava! Ogni giorno studia e non vuole smettere - che perseverante!
The work is difficult for Maria, but she is very clever. Every day she studies and doesn't want to stop -- how persistent!