What does confidential mean?
"Confidential" is an adjective describing information or communication that is meant to be kept private and shared only with those authorized to know it. A confidential document, conversation, or relationship is governed by trust: those who receive it are expected not to disclose it further. The word is common in professional settings — law, medicine, journalism, government, and business — where phrases like "confidential information," "strictly confidential," and "a confidential source" are everyday currency. Its connotation is one of legitimate, often legally protected secrecy rather than furtiveness; medical records are confidential by obligation, not necessarily because they are shameful. Derived from the Latin root fidere, meaning "to trust," it is closely related to "confident" and "confidant," though its meaning has diverged sharply from theirs. Understanding "confidential" is essential to navigating privacy notices, contracts, and workplace norms, since breaching confidentiality can carry serious professional and legal consequences.
adjectiveIntended to be kept secret or private, shared only with those authorized to know. Relating to information given in trust, on the understanding that it will not be disclosed to others.
- (Of information, documents, or communication) intended to be kept private or secret and disclosed only to authorized people.
- (Of a relationship or exchange) involving mutual trust that what is shared will not be revealed; conducted privately.
"The doctor assured her that the test results would remain strictly confidential."
"All medical records are treated as confidential."
"She gave him a confidential briefing before the board meeting."
Every time you see 'Strictly Confidential' stamped on an envelope, you're looking at Latin's fides — trust — doing its job across two millennia.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of confidential
"Confidential" derives from the Latin verb confidere, meaning "to trust fully," formed from com- ("with, together") and fidere ("to trust"), which itself stems from fides, meaning faith or trust. The word entered English in the mid-18th century, developing from earlier senses relating to trust and confidence between people. It shares this Latin root with "confident," "confide," "confidant," and "confidence," all of which preserve the underlying idea of trust — though "confidential" came to emphasize the secrecy that such trust demands.
Related word forms
How confidential is actually used
"Confidential" is largely formal or neutral in register, appearing frequently in legal, medical, business, and journalistic contexts. It often appears in official notices (e.g. "Strictly Confidential") and carries a connotation of professional obligation rather than mere secrecy — information may be confidential because of duty, law, or trust, not necessarily because it is scandalous. The plural noun sense ("confidentials") is rare and dated; the word is almost exclusively adjectival today.
Easily confused with confidential
"Confident" means self-assured or certain, while "confidential" describes information meant to be kept secret — the two words share a root but differ by the suffix -al and entirely in meaning.
A "confidant" is a person one trusts with private matters, whereas "confidential" is an adjective describing the secret nature of information itself.