The antonyms for the word "brought under cultivation" can be identified as "left uncultivated" or "abandoned." When a piece of land is not put to use for cultivation, it stays uncultivated. Such land may be left barren or used for other purposes. For instance, it may be left as a pasture, used for ecological restoration, or used as a reserve for wildlife. Alternatively, land that was once under cultivation may be abandoned due to soil degradation or environmental concerns. In such cases, it may be left as fallow land or allowed to return to its natural state. Fallow land is land that is intentionally left without cultivation for a certain period to regain its fertility.