Scottish dialect: the quality or state of being glaiket; foolishness or silliness.
From glaiket plus the standard English suffix -ness, which creates abstract nouns from adjectives. This demonstrates how productive English word-formation rules apply even to dialectal terms. The word appears primarily in Scottish texts from the 18th-19th centuries.
Adding -ness to Scottish dialect words shows how English-speakers instinctively create nouns—our brains follow patterns we barely notice, automatically turning any adjective into a noun when we need it.
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