in the mistaken/erroneous belief that

phrase

: being mistaken in thinking that

Many people arrived early in the mistaken/erroneous belief that free tickets would be available.

Examples of in the mistaken/erroneous belief that in a Sentence

Recent Examples on the Web

At Trenton State Hospital between 1907 and 1930, the director Henry Cotton performed thousands of invasive surgeries in the mistaken belief that removing patients’ teeth or organs would cure their mental illnesses. — Amanda Foreman, WSJ, 12 Jan. 2023

Far too many people were jumping on the bandwagon in the mistaken belief that anything that’s been going up in value will continue to do so. — Phillip Molnar, San Diego Union-Tribune, 14 Jan. 2022

The chant had spread across the country in the mistaken belief that such a short performance would help heal the wounds of many centuries. — Blair McClendon, The New Republic, 24 May 2021