a person who has been thoroughly convinced of something.
a fanatic, especially a religious or political one.
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Words nearby true believer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences 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.