Definition of "miry"

Only these marishes and myrie bogs, / In which the fearefull ewftes do build their bowres, / Yeeld me an hostry mongst the croking frogs […].

1596, Edmund Spenser, “Book V, Canto X”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie

summer was long over, and cold and frost and miry ways kept them much indoors […]

1908 October, Kenneth Grahame, The Wind in the Willows, New York, N.Y.: Charles Scribner’s Sons

Beyond the bazaar one could see the huge, miry river."

1934 October, George Orwell [pseudonym; Eric Arthur Blair], Burmese Days, New York, N.Y.: Harper & Brothers, Publishers