"marshier" in the adjective sense
1. boggy, marshy, miry, mucky, muddy, quaggy, sloppy, sloughy, soggy, squashy, swampy, waterlogged
of soil) soft and watery
"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"
Source: WordNet® (An amazing lexical database of English)
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