This is the 974th most frequent Macedonian word.
нивни
"Their" (possessive pronoun).
In this context, 'нивни' is a possessive adjective modifying 'идеи', indicating ownership by a third-person plural subject (they).
Нивни идеи секогаш се креативни.
Their ideas are always creative.
Here, 'нивната' is a specific possessive adjective form (feminine singular) for 'third-person plural ownership,' modifying 'куќа' meaning 'house.'
Ја видов нивната куќа вчера.
I saw their house yesterday.
In this instance, 'нивните' is a plural possessive adjective matching 'книги' indicating plural 'books,' showing possession by 'them.'