n. a strange person. : She seems like a kook, but she is just grand, really.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences
It's one kook spouting gibberish, and a scientist debunking it.
Now stating that same opinion will get one branded as a kook or a shill for the tobacco industry.
There was kook in their countenance-an off-kilter vibe that was sympathetic and engrossing.