noun
nutter
NUH-tuh
noun
1
British informal: an eccentric or mentally unstable person.
"The neighbours think he's a bit of a nutter, always shouting at the pigeons."
How to Use Nutter
Learner’s notesIn plain EnglishSlang, mainly British, for someone who acts crazy or unpredictable.
When to use it
Informal and can be mildly offensive — use with care.
UK vs US
Chiefly British slang; American English tends to use "nut" or "crazy person" instead.
Word Forms
nutters plural
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The neighbours think he's a bit of a _____, always shouting at the pigeons.
Etymology
From nut (in the sense "crazy person") plus the agent suffix -er.