nutjob

he's a complete nutjob who believes in alien invasions.

don't listen to him; that guy's a nutjob.

the conspiracy theorist was labeled a nutjob by everyone.

she called him a nutjob after he started yelling.

he's acting like a nutjob over a parking space.

the politician was dismissed as a nutjob by the press.

i think he's a nutjob obsessed with squirrels.

she's a nutjob for collecting rubber ducks.

he's such a nutjob, he talks to his plants.

the eccentric inventor was considered a nutjob.

don't be a nutjob and try to fix the wiring yourself.