Scottish dialect: silly, foolish, or light-headed; lacking sense or judgment.
From glaik plus the past participle suffix -ed (in Scottish, often -et). The formation suggests someone who has been made foolish or someone prone to foolish behavior. This adjective form became standardized in Scottish English by the 17th century.
Burns, Scotland's national poet, used words like 'glaiket' in his poems, which is why Scottish verse has such a distinctive personality—it's full of colorful descriptive words English doesn't have.
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