Nutjob
Definition 1 of 2

Context
'Nutjob' is best used in informal settings; be cautious in formal contexts.

Example: 'I wouldn't use it in a job interview.'
Emotion
The word can carry a humorous tone, but can be offensive if used excessively or carelessly.

Example: 'Be mindful of who you call a nutjob.'
Formal
Avoid using 'nutjob' in professional or academic discussions, as it diminishes seriousness.

Example: 'In academic settings, use terms like 'eccentric' instead.
Compare with
eccentriccrazylunaticweirdomaniac
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