Foolish or silly; behaving like a gowk; tricked or made a fool of.
From 'gowk' (fool) plus the past participle suffix '-ed', functioning as an adjective. Formation shows how verb-like meanings can attach to noun-based words.
When '-ed' attaches to a noun like 'gowk', it can mean 'made into a gowk' (tricked) or 'resembling a gowk' (foolish)—English reuses the same suffix for multiple grammatical jobs.
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