bona fides
Americannoun
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(italics) good faith; absence of fraud or deceit; the state of being exactly as claims or appearances indicate.
The bona fides of this contract is open to question.
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(sometimes italics) the official papers, documents, or other items that prove authenticity, legitimacy, etc., as of a person or enterprise; credentials.
All our bona fides are on file with the SEC.
noun
Usage
Bona fides is from the singular Latin phrase bona fidēs , meaning “good faith,” and has the same meaning in English. But partially because its -es ending makes bona fides look and sound like a plural, it has developed the plural sense “credentials.” This plural use, although criticized by some usage guides, has been increasing in all varieties of speech and writing. The adjective bona fide (without the “s”) is from a Latin phrase meaning “in good faith, with good faith.” It was originally used adverbially in this sense, but is now mainly an adjective. The meaning “authentic, true” is a later development sometimes denounced as sloppy usage, but its use is bona fide and widespread.
Etymology
Origin of bona fides
First recorded in 1835–40; from Latin bona fidēs “good faith”
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Later paintings and prints are used to illustrate the historical events that solidified the samurai’s military bona fides.
From The Wall Street Journal • Mar. 7, 2026
But the writers are never not looking for ways to assert their intellectual or even theological bona fides.
From The Wall Street Journal • Feb. 12, 2026
On paper, Wambsganss’ conservative bona fides were unmatched by many GOP candidates seeking office in Texas.
From Salon • Feb. 3, 2026
Coach David Braun clearly is enamored with Kelly, who cemented his offensive genius bona fides by leading Oregon to a 46-7 record as head coach from 2009 to 2012.
From Los Angeles Times • Dec. 30, 2025
More groups meant more opportunities for women to get closer to the research and establish their bona fides.
From "Hidden Figures" by Margot Lee Shetterly
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
