confidential

confidential — adjective

1. kept hidden from people who are not officially allowed to see or hear it, especi

1.adjectiveB2
Definition

kept hidden from people who are not officially allowed to see or hear it, especially in a work or official setting.

Example

Chidi signed a contract agreeing to keep all client information confidential.

collocation: keep + noun + confidential

The lawyer sent the documents in a confidential envelope marked "Private."

attributive use: confidential envelope

Common collocations
  • strictly confidential
  • highly confidential
  • keep confidential
  • confidential information
  • confidential document
  • confidential report
Synonyms
  • private

    broader term — private information need not involve a formal agreement of secrecy

  • classified

    more specific — used for official government secrets

  • restricted

    emphasises limited access rather than secrecy

Antonyms
  • public

    information that anyone can see or know

  • open

    not hidden or restricted to a specific group

Grammar Patterns

confidential + noun

be + confidential

Usage Note

Often used in formal contexts such as legal, medical, or corporate settings. Frequently paired with intensifiers like 'strictly' or 'highly' to emphasise the need for secrecy.

Common Mistakes

This is very secret information' (when you mean it is protected by policy).
This information is strictly confidential.
'confidential' implies a formal obligation not to share, whereas 'secret' is a broader, less formal term.

2. trusted to handle sensitive information that must not be shared with others, usu

2.adjectiveC1
Definition

trusted to handle sensitive information that must not be shared with others, usually because of one's job or role.

Example

As a confidential assistant to the CEO, Isabela knew about the merger before anyone else.

attributive use: confidential assistant

The ambassador's confidential secretary handled all the classified cables from the foreign ministry.

Common collocations
  • confidential assistant
  • confidential secretary
  • confidential informant
  • confidential agent
Synonyms
  • trusted

    less formal and broader — trusted people may not deal with official secrets

  • discreet

    emphasises the person's behaviour rather than their position

Grammar Patterns

confidential + noun (person role)

Usage Note

Typically used in job titles or role descriptions (e.g. 'confidential secretary', 'confidential agent'). The noun following 'confidential' refers to a person, not a document.

3. behaving or speaking in a quiet, private way that suggests you are sharing somet

3.adjectiveC1
Definition

behaving or speaking in a quiet, private way that suggests you are sharing something personal or secret with the listener.

Example

Her voice dropped to a confidential whisper when the teacher told Yael about the scholarship.

collocation: confidential whisper

Arjun spoke in a confidential tone, as though the entire cafe might overhear their plans.

collocation: confidential tone

Common collocations
  • confidential whisper
  • confidential tone
  • confidential manner
  • confidential look
Synonyms
  • intimate

    stronger emotional closeness, often in personal relationships

  • private

    broader — describes the setting or mood rather than the manner of speaking

Antonyms
  • open

    not hidden or suggesting secrecy

  • public

    done where anyone can see or hear

Grammar Patterns

confidential + noun (voice, tone, manner)

Usage Note

This sense describes a manner or atmosphere, not the content itself. The information may or may not actually be secret — what matters is the feeling of intimacy or secrecy created.

4. officially ranked as requiring protection because unauthorised access could dama

4.adjectiveC1
Definition

officially ranked as requiring protection because unauthorised access could damage national security, falling between restricted and secret in the classification system.

Example

The report was marked "Confidential" and stored in a locked cabinet in the embassy basement.

Only staff with proper clearance may view confidential files from the defence department.

collocation: confidential files

Common collocations
  • classified confidential
  • confidential document
  • confidential memo
  • confidential file
  • marked confidential
Synonyms
  • classified

    broader term covering all security levels from confidential upwards

  • restricted

    the level below confidential in the classification system

Antonyms

Grammar Patterns

confidential + noun (document, report, file)

Usage Note

Part of a fixed classification ladder used by governments: 'restricted' (lowest), 'confidential', 'secret', 'top secret' (highest). Not used as a general synonym for 'secret' in casual speech.

Common Mistakes

I have some confidential news about the party.' (casual use).
I have some confidential information about the company merger.
'confidential' as a classification label sounds odd in casual contexts; use 'secret' or 'private' instead.

Word family

Synonym discussion

Sense: adjective/1

All five words describe information that is not widely shared, but they differ in context and formality. 'Confidential' is the most formal and typically implies a legal or professional duty to protect information — it is the standard term in business, medicine, and law. 'Secret' is broader and less formal; secrets can be personal ('a secret crush') or national, without a formal framework. 'Private' focuses on personal boundaries rather than secrecy — your diary is private even if nobody tries to read it. 'Classified' is a specific government term for information that has been assigned an official security level. 'Restricted' sits at the lowest rung of the classification ladder, limiting access without the same level of secrecy as confidential. For a workplace document that should not leave the office, use 'confidential'; for a surprise birthday plan, use 'secret'; for something that belongs to you alone, use 'private'.

confidential ↗secret ↗private ↗classified ↗restricted

Common collocations

Nouns

Adverbs

Phrases

  • keep confidential
  • remain confidential
  • treat as confidential

Etymology

LatinFrenchEnglish

From Latin 'confidentia' (trust, confidence), from 'confidere' (to trust fully, to rely upon). The sense of 'confidential' as 'secret or private' emerged in English by the mid-1700s, carrying the idea that something is shared only with people you trust enough to keep it safe. The use as a government security classification dates to the early 1900s.