Use 'clayey' to describe a distinct heavy and wet quality of soil or sediment. We can't plant roses here; the clayey ground isn't suitable for their roots.
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Not Always Bad
'Clayey' might imply poor soil for some plants, but can be good for others like lotus. The lotus thrives in the clayey waters of the pond.
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Construction Material
'Clayey' can also refer to materials in brick-making and pottery, valued for durability. The clayey material was perfect for crafting pottery.