The form of the adjective is -zuri, it will take different prefixes based on what noun class the noun it is modifying is in.
How can we work out the noun class? Do they just have to learned individually?
Yeah, it's just memorizing the noun with the class. Some of them are easier to distinguish than others, though, for example Ki/Vi noun will start with Ki or Ch in singular and Vi or Vy in plural, but for others like the N/N class, nouns could start with anything and remain the same in plural, which is when memorizing the noun class with the noun comes in handy.