to neglect one's work, duties, or studies over a long duration

他因家事久旷职守，深感愧疚。

to remain single or live without a partner for a long time

他久旷之身，难免感到孤独。

to leave land uncultivated or fallow for a long period of time

这片土地久旷，如今已是荒草丛生。