"the ground was boggy under foot"
"a marshy coastline"
"miry roads"
"wet mucky lowland"
"muddy barnyard"
"quaggy terrain"
"the sloughy edge of the pond"
"swampy bayous"

"the cake fell; it's a doughy mess"

"she was fat and inert"
"a sluggish worker"
"a mind grown torpid in old age"