ipsedixitist

/ˌɪpsɪˈdɪksɪtɪst/

Etymology

From ipse dixit + -ist.

ipsedixitist means One who makes unfounded, false and dogmatic assertions. Lexicurio rates it Sui generis — a strength score of 87 out of 100.

Why this word is great

IPSEDIXITIST — [Noun] One who makes dogmatic, unfounded assertions presented as indisputable fact. From Latin *ipse dixit* ("he himself said it"), a phrase attributed to the disciples of Pythagoras to end debate by citing the master's unsupported word, + the English suffix *-ist* (denoting an adherent or practitioner). Unlike a "dogmatist," who may anchor claims in a formal, if rigid, doctrine, or a "credulous person," defined by passive gullibility, the ipsedixitist actively proclaims private certainty as universal law. It is the pundit dismissing a century of data with a wave and "I'm telling you," the uncle thumping the table to declare the exact date of the next financial collapse, the online sage whose every "Actually…" prefaces a revealed truth with no lineage but their own conviction—a wearying spectacle of authority borrowed from no source but the speaker’s own insistence, a small monument to the desire for certainty without the burden of proof.

noun

One who makes unfounded, false and dogmatic assertions.