What is another word for "quagmire"?

Roget's Thesaurus (1911) lists these synonyms for "quagmire": bog, boggy, fen, fenny, marish, marsh, marshy, moorish, moory, morass, moss, mud, muddy, paludal, plashy, poachy, quaggy, sloppy, slough, slush, soft, squash, squashy, sump, swamp, swampy, wash.