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https://ejje.weblio.jp/content/confidential
英語「confidential」の意味・読み方・表現 | Weblio英和辞書
Kept, or meant to be kept, secret within a certain circle of persons; not intended to be known publicly Synonyms: private, classified, off the record, privileged, secret, dern (obsolete) Antonyms: public, on the record The newspaper claims a leaked confidential report by the government admits to problems with corrupt MPs.