- a person who has been thoroughly convinced of something.
- a fanatic, especially a religious or political one.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for true believer
Ahmadinejad has more than a little of this true-believer faith; his boss, the Supreme Leader Ali Khameini, has much less of it.Ahmadinejad Shows His Soft Side in U.N. Speech
Reuel Marc Gerecht
September 27, 2012