不纯洁

例句：

1. 1.The water was found to be contaminated with chemicals.
   水被发现被化学物质污染。
2. 2.The food was found to be unfit for human consumption.
   食物被发现不适合人类食用。
3. 3.The room was found to be dirty and unsanitary.
   房间被发现又脏又不卫生。