Silly, foolish, or behaving in a manner characteristic of a goose; somewhat goosey or goose-like.
From 'goose' + '-ish' suffix (meaning somewhat or inclined to). The '-ish' suffix is one of English's oldest and most productive ways to create adjectives describing vague qualities.
The '-ish' suffix is brilliantly vague—'goosish' doesn't mean fully goose-like, just *somewhat* silly or *kind of* foolish, which is perfect for capturing those moments when someone is being a little bit goofy but not entirely ridiculous!
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