truthern.
/ˈtruːθə/, U.S. /ˈtruθər/ colloquial (originally and chiefly U.S.).
1. A person who tells the truth; a truth-teller. Frequently contrasted with liar.
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1910 J. C. Sindelar Washington Day Entertainm. 16 My dad is one That's truthful like George Washington... He's sure a truther other ways An' just deserves all kinds o' praise.
1915 Daily Leader (Grand Rapids, Wisconsin) 14 July 2/2 A liar can't begin to start the riots a truther can.
2014 M. Lafferty Ghost Train to New Orleans xii. 159 ‘You lied to me to scare me about ghosts, and then ghosts..end up hunting you.., so the ghosts made a truther out of a liar.’ She frowned. ‘Truth-teller. Something.’
2. Chiefly depreciative. Usually with capital initial: a person who believes that the U.S. government is involved in a conspiracy to conceal the truth about the attacks on New York and Washington, D.C. on 11 September 2001. Also more generally: a person who doubts the generally accepted account of any event or situation; a conspiracy theorist. Frequently with preceding modifier, as 9/11 truther, etc.
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2005 911q Truthers confront NIST on Twin Towers in alt.fan.gene-scott (Usenet newsgroup) 27 June There was an open public conference, which featured even more grilling by 9/11 truthers.
2008 M. Taibbi Great Derangem. 7 The Truthers..believed that reporters for the Washington Post, the president, and the front-line operators of NORAD were equally capable of murdering masses of ordinary New York..employees.
2009 proteinwisdom.com (Nexis) 28 May Nothing is solidified other than the conspiracy-theorists sense of self-importance. I hope the Chrysler Truthers live long and prosper in their own fun way.
2011 Wall St. Jrnl. 7 May c7/2 One Truther, a freelance writer, claims that media organizations are working with the military-industrial complex to suppress what really happened on 9/11.
2012 MSNBC: The Last Word with Lawrence O'Donnell (transcript of TV programme) (Nexis) 5 Oct. Within minutes of the jobs report today, Twitter filled with Republicans saying the numbers must be cooked. They were job truthers.
This is a new entry (OED Third Edition, December 2015; most recently modified version published online March 2022).
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n.1910