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A person who’s loudly confident but secretly fragile. A kleen hates being challenged, thrives on getting into people’s heads, and uses petty mind games to wind others up when they feel threatened. Often talks a big game, especially about football, despite delivering Sunday-league performances at best. Common traits include selective hearing, emotional buffering when confronted, and an uncanny ability to dish it out but never take it. “Don’t argue with him, he’s a proper kleen — you’ll get mind-gamed for 20 minutes and still watch him misplace a five-yard pass.” Etymologically mysterious. Behaviourally predictable. The universe contains many such creatures.
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