Truther

//ˈtɹuθɚ// noun, slang

noun, slang ·Moderate ·College level

Definitions

Noun
  1. 1
    Someone who tells the truth. US, colloquial

    "A liar can't begin to start the riots a truther can."

  2. 2
    Someone who believes that the US government was responsible for the 9/11 attacks. US, colloquial

    "[signed] 9/11 Truther"

  3. 3
    A conspiracy theorist who does not believe the accepted story about some significant event, fact, etc. broadly

    "For instance, "truthers" who believe in a US government conspiracy to destroy the pentagon"

  4. 4
    An advocate, especially for a headcanon. humorous, slang

Synonyms

All synonyms
conspiracy theoristconspiracy theoristconspirophile

Example

More examples

"A liar can't begin to start the riots a truther can."

Etymology

From truth + -er (occupational suffix) or + -er (“supporter”). For sense 2, directly from name of the 9/11 Truth movement.

Related phrases

anti vaxxerconspiracy theoristflat earther

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