too smart by half

The phrase "too smart by half" is an idiom used to describe someone who is overly clever or intelligent to the point of being arrogant or self-absorbed. It implies that the person's intelligence may be causing them to make mistakes or overlook important aspects due to their excessive confidence in their own abilities. Essentially, it suggests that being overly smart can have negative consequences if not balanced with humility and practicality.

-- ChatGPT

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