Resembling, containing, or characteristic of a fen; marshy and boggy.
From fen (wetland) plus the Old English suffix -ish, meaning 'having the quality of.' This follows the common English pattern of adding -ish to nouns to create adjectives describing similar qualities.
Fenlands across England—like the Norfolk Broads and the Fens near Cambridge—shaped entire regional cultures. People developed special boats, tools, and even walking patterns to navigate these waterlogged landscapes, and 'fennish' was essential vocabulary for describing whether land was passable.
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