kook
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
An eccentric, strange or crazy person.
Register: slang
Where it’s used:
Used
American English
Examples
The kook we will always have with us, to paraphrase Jesus, but the kooks of yore had to work to maintain their kookery and locate fellow kooks. They had to pick up their kook phone, subscribe to the kook newsletter, drive to the kook convention. Nowadays, all the kook has to do is log in to Facebook
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “kook” mean?
An eccentric, strange or crazy person.
Is “kook” formal or informal?
kook is generally slang.