This is the 872nd most frequent Serbian word.
неопходна
Necessary.
Here, 'неопходна' functions as an adjective meaning 'necessary', referring to the noun 'пажња' (attention).
За овај задатак је неопходна пажња.
Attention is necessary for this task.
In this instance, 'неопходна' serves as an adjective meaning 'necessary', qualifying the noun 'припрема' (preparation).
Пре одласка на пут, припрема је неопходна.
Preparation is necessary before going on a trip.
In this sentence, 'неопходна' is used as an adjective meaning 'essential' or 'necessary', describing the noun 'вода' (water).