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nut·​ball ˈnət-ˌbȯl How to pronounce nutball (audio)
plural nutballs
chiefly US, informal
: a foolish or eccentric person
… much as you'd like to say this guy is just a weirdo, a California nutball doing the trendiest of self-help stuff, you can't write it off so fast.Rick Telander
also, sometimes offensive : someone who is not mentally sound


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: eccentric, nutty
a nutball idea
… a thoroughly nutball comedy …Glenn Garvin
"… It was sort of like, here's this great, juicy nutball character who can talk about murder and jewelry all in the same sentence, and you buy it. …"Ryan Murphy
also, sometimes offensive : mentally unsound

Word History



nut entry 1 + -ball (as in oddball, screwball entry 1)

First Known Use


1959, in the meaning defined above


1963, in the meaning defined above

Time Traveler
The first known use of nutball was in 1959

Dictionary Entries Near nutball

Cite this Entry

“Nutball.” Dictionary, Merriam-Webster, Accessed 14 Jun. 2024.

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