This is the 888th most frequent Slovenian word.
njegova
"Njegova" means "his" in English.
Here, 'njegova' describes the noun 'responsibility,' attributing ownership to a male subject.
To je njegova odgovornost.
This is his responsibility.
In this sentence, 'njegova' is a possessive adjective indicating that the book belongs to a male subject.
Njegova knjiga je na mizi.
His book is on the table.
In this usage, 'njehovo' agrees in gender and case with the feminine object 'sestro,' denoting possession by a male.