This is the 299th most frequent Lithuanian word.
nauji
"New" (plural form).
Here, 'nauji' describes 'langai' (windows), also nominative plural and masculine.
Ar tai yra nauji langai?
Are these new windows?
The word 'nauji' modifies the noun 'batai' (shoes), which is nominative plural and masculine.
Mano draugai nupirko nauji batai.
My friends bought new shoes.
In this structure, 'nauji' refers to 'automobiliai' (cars), which is nominative plural and masculine, suggesting emphasis on novelty.