bona fides
C1/C2Formal, professional, academic, legal
Definition
Meaning
The sincerity or honesty of a person's intentions; their good faith.
Evidence or documents proving a person's identity, qualifications, or legitimacy.
Linguistics
Semantic Notes
Traditionally a singular Latin noun phrase ('bona fides' = good faith). In modern English, it is often treated as a plural noun ('his bona fides are...'), especially when referring to credentials. This plural usage is now standard in many contexts but may still be critiqued in highly formal or purist registers.
Dialectal Variation
British vs American Usage
Differences
Both treat it as a plural noun when referring to credentials. Slight preference in American English for the plural usage in all contexts.
Connotations
Slightly more common in American legal and journalistic contexts. In British English, retains a stronger link to its classical Latin origins in certain formal writing.
Frequency
More frequent in American English, particularly in professional and media discourse.
Vocabulary
Collocations
Grammar
Valency Patterns
VERB (establish/prove/question) + POSSESSIVE + bona fideshave + bona fides + as + NOUN PHRASEVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Used when verifying a new partner's or employee's background and reliability. 'The investor demanded to see the startup's financial bona fides.'
Academic
Refers to a researcher's qualifications and the authenticity of their sources. 'The historian's bona fides on the subject are unquestioned.'
Everyday
Rare in casual conversation. Might be used humorously or ironically. 'I showed her my cooking bona fides by making a perfect omelette.'
Technical
In law, refers to the principle of good faith in negotiations or contracts. 'The contract was voided due to a lack of bona fides.'
Examples
By CEFR Level
- His references were checked to confirm his professional bona fides.
- They questioned her bona fides as a community representative.
- The journalist's bona fides were established by her decades of award-winning reporting in the region.
- Before the sensitive negotiation, both parties were required to demonstrate their bona fides through independent verification.
- The committee scrutinised the applicant's academic bona fides, paying close attention to her research publications.
Learning
Memory Aids
Mnemonic
Think of a BONA FIDE (genuine) ID card. Your 'bona fides' are your genuine IDs or proofs of who you are.
Conceptual Metaphor
CREDENTIALS ARE OBJECTS OF VALUE (to be presented, checked, accepted). GOOD FAITH IS A SOLID FOUNDATION (for trust or agreement).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate literally as 'хорошие веры'.
- Avoid confusing with 'добросовестность' alone when referring to physical credentials.
- When meaning 'credentials', equivalent phrases are 'документы, подтверждающие личность/квалификацию' or simply 'рекомендации/портфолио' in context.
Common Mistakes
- Treating it as always singular ('his bona fides is'). While traditional, the plural is now dominant.
- Using it as an adjective ('a bona fides offer'). The adjective is 'bona fide'.
- Misspelling as 'bonafides' (should be two words).
Practice
Quiz
In which sentence is 'bona fides' used correctly?
FAQ
Frequently Asked Questions
Historically singular, but modern English overwhelmingly treats it as plural when referring to credentials or proofs of legitimacy (e.g., 'his bona fides are impressive'). The singular treatment ('his bona fides is') is now rare and considered very formal or pedantic.
'Bona fide' is an adjective meaning 'genuine' or 'sincere' (a bona fide offer). 'Bona fides' is a noun meaning 'good faith' or, more commonly, 'evidence of legitimacy or credentials' (check his bona fides).
It is quite formal. In everyday speech, simpler words like 'credentials', 'background', or 'proof' are more common. Using 'bona fides' can sound deliberately technical or pretentious in casual settings.
The standard English pronunciation is /ˌbəʊ.nə ˈfaɪ.diːz/ (BONE-uh FYE-deez) or /ˌboʊ.nə ˈfaɪ.diːz/ (BOH-nuh FYE-deez). The Latinate 'bow-na FEE-days' is not the common English pronunciation.