Flat-earther

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A person who believes or advocates the claim that the planet Earth is flat.

    "His commitment to remaining a flat-earther seems to be strengthened by counterarguments rather than weakened by them."

  2. 2
    A person who believes or advocates an outlandish, discredited theory; a person who refuses to acknowledge the truth despite overwhelming evidence. broadly, derogatory, figuratively

    "2008, Bob Sweere, "Voice of the Day: Global warming? Yes," News-Leader.com (Missouri), 16 Jun. (retrieved 1 July 2008), Global warming is settled, unless you are a flat earther or an energy company apologist."

Synonyms

All synonyms
;flat-earthistflattardflerfplatygaeanplatygaeanist

Example

More examples

"His commitment to remaining a flat-earther seems to be strengthened by counterarguments rather than weakened by them."

Etymology

From flat-earth + -er.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.