This is the 12719th most frequent Polish word.
niepoprawne
"Niepoprawne" means "incorrect" or "wrong" in English.
In this sentence, 'niepoprawne' is used as an adjective to describe the sentence as incorrect or erroneous.
To zdanie jest niepoprawne.
This sentence is incorrect.
Here, 'niepoprawne' functions as an adjective modifying 'odpowiedzi' (answers), indicating that they are wrong or mistaken.
Niepoprawne odpowiedzi należy poprawić na sprawdzianie.
Incorrect answers need to be corrected on the test.
In this case, 'niepoprawne' is used to describe 'zachowanie' (behavior) as inappropriate or unsuitable.