Marked or affected by gullies; carved with water-worn channels or ravines.
From 'gully' (or 'gulley') plus the adjective suffix '-ed,' meaning having the characteristic described. The past participle form functions as an adjective.
Erosion happens in visible gulches and valleys but also invisibly in soil—a hillside doesn't look 'gullied' until the damage is done, making erosion a sneaky geological process.
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