In a goosish manner; in a silly, foolish, or goose-like way.
From 'goosish' + '-ly' adverbial suffix. This represents standard English adverb formation, where '-ly' converts adjectives into adverbs describing how actions are performed.
Adverbs ending in '-ly' create a rhythm and formality in English that's actually quite musical—'goosishly' sounds more deliberate and comical than just saying 'sillily,' giving the word almost theatrical flair!
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