confidential

American  

[kon-fi-den-shuhl] / ˌkɒn fɪˈdɛn ʃəl /

adjective

1. spoken, written, acted on, etc., in strict privacy or secrecy; secret.

   a confidential remark.

   Synonyms:

   private, restricted

2. indicating confidence or intimacy; imparting private matters.

   a confidential tone of voice.

   Synonyms:

   familiar, intimate

3. having another's trust or confidence; entrusted with secrets or private affairs.

   a confidential secretary.

   Synonyms:

   private, trustworthy

4. (of information, a document, etc.)

   1. bearing the classification confidential, usually being above restricted and below secret.

   2. limited to persons authorized to use information, documents, etc., so classified.

---

confidential British  

/ ˌkɒnfɪˈdɛnʃəl /

adjective

1. spoken, written, or given in confidence; secret; private

2. entrusted with another's confidence or secret affairs

   a confidential secretary

3. suggestive of or denoting intimacy

   a confidential approach

---

Related Words

See familiar.

Other Word Forms

• confidentiality noun
• confidentially adverb
• confidentialness noun
• nonconfidential adjective
• nonconfidentiality noun
• nonconfidentially adverb
• nonconfidentialness noun
• quasi-confidential adjective
• quasi-confidentially adverb

Etymology

Origin of confidential

First recorded in 1645–55; from Latin confīdenti(a) confidence + -al ¹

Explanation

If you get a letter stamped confidential, that means you're not supposed to tell anyone else what it says. It's private and you're not supposed to blab about it. Confidential suggests that you're being let in on a secret — as in Kitchen Confidential, the title of a book by Anthony Bourdain, a famous chef, in which he tells unappetizing stories about the restaurant industry. If you confide in someone, you are trusting him or her with confidential or secret information. Choose your confidants wisely!

Example Sentences

“We see the announcement as positive and supportive of earnings growth,” says Nebhani, noting that details of the portfolio are confidential.

From The Wall Street Journal • Apr. 9, 2026

The Los Angeles city clerk declined to provide information on Pratt’s residence, saying that candidates’ addresses are confirmed when they file, but can remain confidential.

From Los Angeles Times • Apr. 6, 2026

No lawyer in America thinks drafting a confidential memo in Google Docs waives the privilege over its contents.

From The Wall Street Journal • Apr. 6, 2026

The IPO is months away, with SpaceX filing confidential IPO documents this week, according to multiple reports.

From Barron's • Apr. 3, 2026

The man introduced himself as Chuck E. Muckle, a vice-president of something-or-other for Mother Paula’s All-American Pancake Houses, Inc. In a confidential tone, he added, “We need some discreet assistance here.”

From "Hoot" by Carl Hiaasen

Related Words

• classified
• hush-hush
• intimate
• private