necessary
/ˈnesəsəri ˈने̮ससरि/ adj. necessary (for somebody/something) (to do something) that is needed for a purpose or a reason (प्रयोजन विशेष या कारण विशेष से) आवश्यक, ज़रूरी
A good diet is necessary for a healthy life.
If necessary I can take you to work that day.
✪ विलोम unnecessary