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Lunatic (Noun)

A reckless impetuous irresponsible person.

Nouns denoting people.

The stunt driver was labeled a lunatic by the racing community for performing such death-defying stunts.
Her sister's impulsive decisions and reckless spending habits led her family to consider her a lunatic.
His neighbors often whispered behind his back, calling him a lunatic for having dozens of wild animals roaming around his backyard.
People in the small town were convinced that the owner of the failing amusement park was a lunatic for opening it despite safety concerns.
Friends of the billionaire worried he had become a lunatic for giving away millions to dubious causes on a whim.

An insane person.

Nouns denoting people.

The police found a lunatic wandering the streets, talking to himself and causing a scene.
In the old days, they used to lock up lunatics in asylums with little to no care or treatment.
The judge declared the defendant a lunatic and therefore not responsible for his actions.
Her brother was a lunatic, always coming up with wild schemes and expecting everyone to follow along.
The neighbors avoided the old man, thinking he was a lunatic due to his strange behavior and outlandish stories.