said of a person's knowledge, intelligence or, in some cases, opinion. put another way, you're saying the person knows a lot about everything, but nothing about a given topic.
"That Sarah Palin sure knows foreign policy!"
"She's all talking points. Her knowledge is a mile wide and an inch deep."
by OuLiPo February 27, 2010
Impressive at first but with experience, found to be stupid or unimaginative
"That John Kerry seems to have gravitas."
"He's a mile wide and an inch deep."
by octopod April 10, 2004

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