As adjectives the difference between marshy and wiery
is that marshy is of, or resembling a marsh; boggy while wiery is or wiery can be wet; moist; marshy.
marshy
English
Adjective
(er)
Of, or resembling a marsh; boggy.
Growing in marshy ground.
Derived terms
* marshiness
wiery
English
Etymology 1
From (wire); compare (fiery).
Etymology 2
Compare wearish.