1. (难以避免或摆脱的)复杂局势，困境
A quagmire is a difficult, complicated, or unpleasant situation which is not easy to avoid or escape from.

2. 沼泽地;泥泞地;泥潭
A quagmire is a soft, wet area of land which your feet sink into if you try to walk across it.

1. a soft wet area of low-lying land that sinks underfoot

Synonym: mirequagmorassslack