COMPARISON OF ADVERBS AND ADJECTIVES:

The COMPARATIVE form of adjectives and adverbs is expressed by preceding them with "più" <more> or "meno" <less>:
"alto" <tall>, "più alto" <taller>;
"diligentemente" <diligently>, "meno diligentemente" <less diligently>.
The complete comparison is usually expressed with "di" <than> before nouns or pronouns and "che" <than> before modifiers:
"Giovanni è più vecchio di te" <John is older than you>;
"La lezione è più istruttiva che divertente" <The lesson is more informative than entertaining>.