English Reference
adjective

confidential

adj.
US /ˌkɑnfəˈdɛnʃəɫ/ UK /kˌɒnfɪdˈɛnʃəl/ con·fi·den·tial

  1. 01 B2 Upper Intermediate

    meant to be kept secret and not told to other people.

    intended to be kept secret or private; restricted to a specific circle of individuals.

    Simple

    The doctor kept all of his patient's medical records in a confidential file.

    In context

    The legal team reminded all staff that the details of the settlement were strictly confidential and could not be discussed with the press.

    Usage

    Often used in professional contexts like law, medicine, and business.

  2. 02 C2 Proficiency Archaic

    someone who is trusted with secrets or a job that requires great trust.

    occupying a position of trust or being worthy of being trusted with private information.

    Simple

    He served as a confidential clerk to the governor for many years.

    In context

    In the nineteenth-century novel, the protagonist relies heavily on his confidential servant to manage his private affairs and delicate correspondence.

  3. 03 C2 Proficiency Literary

    speaking in a quiet, private way as if sharing a secret.

    characterised by the sharing of confidences or an intimate, private manner of communication.

    Simple

    She leaned in and spoke in a low, confidential whisper.

    In context

    The two friends retreated to the corner of the library, their voices dropping into the confidential tone of those sharing long-held secrets.

Don't confuse

confidential vs confident — Confident describes a person's self-assurance, while confidential describes information that must be kept secret.

It says its free and confidential telephone helpline, email and web chat service helped more than 30,000 people last year.

BBC News· 15 Aug 2026

Anyone with information is asked to contact Ashbourne Garda Station on (01) 801 0600, the Garda Confidential Line on 1800 666 111, or any Garda station.

BreakingNews.ie· 15 Aug 2026

From Latin confidentia + -al.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated