"Gleg" is a complimentary word for a particular alertness of mind and eye, the quick perception that misses nothing and understands fast. It appears in Scots characterisation to praise the person who sees clearly and thinks quickly, and it carries the Scots admiration for practical intelligence over mere book-learning. The word's short, sharp sound suits its meaning — a single syllable that itself demonstrates the quality it describes. In poetry "gleg" is both description and aspiration, celebrating the faculty of clear, rapid perception that good verse itself requires.

Gleg belongs to the vocabulary of sharp, practical intelligence — the quick eye that sees everything, the mind that processes fast and accurately. In a culture where observation and wit were prized social virtues, to be "gleg" was genuine praise. In verse, "gleg een" (keen eyes) appear in contexts of surveillance, desire, and perception — the lover who notices every detail, the satirist who misses nothing, the hunter with perfect sight. For students, "gleg" is a useful counterweight to words like "glaikit" — together they mark the opposite poles of the Scots spectrum from sharp perception to vacant obliviousness. The word rewards attention in poems about looking, seeing, and knowing.