More characterized by gutters or channels; having more grooves or furrows, or more drop-like in appearance.
From 'gutty' or 'gutter' + comparative suffix '-er', indicating a greater degree of having grooves, channels, or drop-marked qualities.
The comparison 'guttier' might seem obscure, but it perfectly describes how erosion gradually makes surfaces more channeled—like how rain slowly creates deeper gutters in hillsides.
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