noun Slang.
an eccentric, strange, or foolish person.
an insane person.

1955–60; perhaps alteration of cuckoo

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World English Dictionary
kook (kuːk)
informal (US), (Canadian) an eccentric, crazy, or foolish person
[C20: probably from cuckoo]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
There was kook in their countenance-an off-kilter vibe that was sympathetic and engrossing.
Now stating that same opinion will get one branded as a kook or a shill for the tobacco industry.
It's one kook spouting gibberish, and a scientist debunking it.
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