In a sharp, keen, or quick-witted manner; with keen perception or understanding, primarily in Scottish English.
From gleg + -ly (adverb marker). Converts the Scottish adjective into an adverb following English morphology rules.
This Scottish adverb shows how the -ly suffix works so consistently in English that you can add it to almost any adjective to make an adverb, making the language remarkably productive and creative.
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