Word page
Mumpsimus means a stubborn error or old habit kept even after it has been shown to be wrong. It belongs to archaic and forgotten words and works best in historical fiction, mock-Elizabethan insults, and old-fashioned comic prose. It still feels usable today, especially when you want a word with more character than the plainest alternative.
Mumpsimus means a stubborn error or old habit kept even after it has been shown to be wrong. It is usually pronounced MUHMP-sih-muhs, and today it is still readable to modern audiences, even if it sounds more deliberate than everyday speech.
In plain English, mumpsimus refers to a stubborn error or old habit kept even after it has been shown to be wrong. It is most useful when a plain label would tell the truth but miss the tone, flavor, or comic edge.
Mumpsimus feels absurd because its repeated sounds give it a bounce or wobble that makes the word feel half descriptive and half sound effect.
Mumpsimus is generally traced to origin uncertain. In modern use, the history matters less than the strong tone the word still carries.
Mumpsimus is still usable today, especially when you want language that feels more distinctive than the plainest modern alternative.
Use mumpsimus when you want a more vivid, characterful choice than the plain everyday alternative. It works especially well in historical fiction, mock-Elizabethan insults, and old-fashioned comic prose.
anon, apple-john, bat-fowling, beef-witted, belike
modern phrasing, plain speech, everyday wording
Edited by Absurd Words. Last updated: May 9, 2026. See the editorial policy for how definitions, examples, labels, and update checks are handled on the site.
