Quagmire

ˈkwæɡˌmaɪər

noun

a soft boggy area of land that gives way underfoot; an awkward, complex, or hazardous situation

The word 'quagmire' originates from the 1550s and combines 'quag' (meaning 'bog' or 'marsh') with 'mire' (meaning 'swamp'). It vividly describes a challenging and unstable situation that can be difficult to navigate, much like the treacherous terrain it refers to.

Ron did very well until he reached the hinkypunk, which successfully confused him into sinking waist-high into the quagmire.

J. K. Rowling

Harry Potter and the Prisoner of Azkaban

Sometimes, however, coming from those lofty mountains which dominate the moral horizon, justice, wisdom, reason, right, formed of the pure snow of the ideal, after a long fall from rock to rock, after having reflected the sky in its transparency and increased by a hundred affluents in the majestic mien of triumph, insurrection is suddenly lost in some quagmire, as the Rhine is in a swamp.

Victor Hugo

Les Misérables