conspiratorialistn.adj.
/kənˌspɪrəˈtɔːrɪəlɪst/, /ˌkɒnspɪrəˈtɔːrɪəlɪst/, U.S. /kənˌspɪrəˈtɔriələst/ Originally U.S.
A. n.
A person who believes in or promotes conspiracy theories, a conspiracy theorist; = conspiracist n.
ΚΠ
1965 D. Macdonald in Esquire Mar. 132/4 It seems not to have occurred to the conspiratorialists that the Kennedy-Johnson government..would not at all object to discovering the assassination was the work of..Dallas millionaires..or any of the other right-wing persons and groups they are supposed to be masochistically protecting.
1972 Wall St. Jrnl. 25 Sept. 12/5 Mr. Moss is no conspiratorialist; sufficient unto each terrorist group is the terror thereof.
1985 Guardian (Nexis) 12 Mar. The arch conspiratorialists see Sir Keith as a Machiavellian who has, with supreme skill, deliberately provoked the teachers into going on strike.
2004 J. McEnteer Deep in Heart vi. 119 Conspiratorialists tend to find significance or human intention even where none exists.
B. adj.
Of or relating to conspiratorialists or to conspiracy theories; = conspiracist adj.
ΚΠ
1973 P. Goldman Death & Life Malcolm X xlviii. 362 A certain irremediable skepticism about conspiratorialist explanations of events where nonconspiratorialist explanations appear to be adequate.
1978 R. Nixon Memoirs 1012 He even put forward what must be the ultimate conspiratorialist notion: that the Zionists were behind the Palestinian terrorists.
2001 V. Campion-Vincent in J. Best How Claims Spread x. 212 Also very conspiratorialist was the early movie Fleisch..in which the gang capturing foreign tourists in New Mexico delivers their captives to the Roswell..airbase hospital.
This is a new entry (OED Third Edition, December 2009; most recently modified version published online March 2022).
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n.adj.1965