In a gullish manner; in a way that's foolish or easily deceived; somewhat like a dupe.
From 'gullish' (foolish, easily deceived) plus the adverb suffix '-ly.' Combines 'gull' + '-ish' + '-ly' for a doubly-modified form.
Stacking suffixes like 'gullish' + 'ly' = 'gullishly' shows English's modular genius—we can keep adding to words to fine-tune meaning, like adding filters to a photo.
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