Questions & Answers about Il libro è quasi nuovo.
Why doesn't quasi change its ending like adjectives do?
If I wanted to say the book is "very" new, would I use molto the same way as quasi?
Yes! You would say Il libro è molto nuovo. Even though molto can sometimes act as an adjective (meaning "many" or "a lot of"), here it acts as an adverb describing the adjective nuovo. As an adverb, molto doesn't change its ending.
Why does nuovo end in -o here?