Standard Lemma guide

flat-earther

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

Examples

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

Meaning relationships

Synonyms: flat-earthist, platygaean, platygaeanist, flattard, flerf

Antonyms: globe-earther, sphericist, globehead, glober, globetard

2

noun

Meaning 2

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

Definition source: English Wiktionary via Wiktextract

Usage: broadly, derogatory, figuratively

Examples

  • 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.
  • When it comes to vaccine safety, they are diehard flat-earthers: the microchips and mercury are articles of faith.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree English flat-earth Proto-Indo-European *-yósder. Proto-Italic *-āzios Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English flat-earther From flat-earth + -er.

Across languages

Translations

24 source translations are retained for this English entry.

  • Chinese Mandarin: 地平論者 /地平论者 (dìpínglúnzhě) — person who believes the Earth is flat
  • French: terreplatiste — person who believes the Earth is flat
  • French: platiste — person who believes the Earth is flat
  • Galician: terraplanista — person who believes the Earth is flat
  • German: Flacherdler — person who believes the Earth is flat
  • German: Flacherdlerin — person who believes the Earth is flat
  • German: Flachweltler — person who believes the Earth is flat
  • German: Flachweltlerin — person who believes the Earth is flat
  • Greek: επιπεδιστής (epipedistís) — person who believes the Earth is flat
  • Greek: επιπεδίστρια (epipedístria) — person who believes the Earth is flat
  • Hungarian: laposföld-hívő — person who believes the Earth is flat
  • Italian: terrapiattista — person who believes the Earth is flat
  • Macedonian: рамноземјаш (ramnozemjaš) — person who believes the Earth is flat
  • Macedonian: рамноземец (ramnozemec) — person who believes the Earth is flat
  • Polish: płaskoziemiec — person who believes the Earth is flat
  • Polish: płaskoziemka — person who believes the Earth is flat
  • Portuguese: terraplanista — person who believes the Earth is flat
  • Russian: плоскоземе́лец (ploskozemélec) — person who believes the Earth is flat
  • Russian: плоскоземе́льщик (ploskozemélʹščik) — person who believes the Earth is flat
  • Russian: плоскоёб (ploskojób) — person who believes the Earth is flat
  • Spanish: terraplanista — person who believes the Earth is flat
  • Spanish: tierraplanista — person who believes the Earth is flat
  • Swedish: plattjordare — person who believes the Earth is flat
  • Turkish: düz dünyacı — person who believes the Earth is flat