I recently spent time with a person who qualified “unique”: things were “very unique” or “rather unique” and even “extremely unique.”
Did I say something? No. Did I want to? Did I ever. “Unique” means one of a kind. Nothing else like it (whatever “it” is) exists. Therefore, it can’t be qualified. Either something is unique or it isn’t. Qualifying “unique” is rather like being a little bit pregnant.