flat-earther

American

[flat-ur-ther] / ˈflætˈɜr θər /

noun

a person who adheres to the idea that the earth is flat.
a person who clings to an idea or theory that has long been proved wrong.

flat-earther British

noun

informal a person who does not accept or is out of touch with the realities of modern life

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of flat-earther

1930–35; flat earth + -er ¹

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“It’s like asking a flat-earther to pilot our next mission to space.”

From Salon • Nov. 15, 2024

“Had there been a follow up to my statement that I had been immunized, I would have said, ‘Look, I’m not some sort of anti-vax flat-earther.

From Los Angeles Times • Nov. 5, 2021

Before Logan Paul got onstage at a flat-earther conference to support a knuckleheaded conspiracy theory, he told the audience he was feeling grateful that day.

From The Verge • Dec. 3, 2018

Will we find out he's shitty to women or a flat-earther or that the one person he feels bad for in all of this is Roseanne?

From Golf Digest • Sep. 13, 2018

Shortly after, the Boston-based Sports Legacy Institute, a nonprofit concussion-research group, threw NFL Commissioner Roger Goodell a party and presented Goodell — a notorious flat-earther when it came to concussions — with its Impact Award.

From Washington Post • Jan. 10, 2016

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023