Have you ever wondered how to say secret in Japanese? In this article, we will analyze the word himitsu [秘密] which means secret and also some synonyms like naisho and kimitsu. You will also learn many secret words for your vocabulary.
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What does Himitsu mean?
The word himitsu [秘密] can be a noun or an adjective of the type na [な] that means secret; confidentiality; privacy; mystery; discretion; secretive and also esoteric teachings. The word [秘密] has a greater, generalized and more enduring feeling.
The word himitsu is composed of the ideogram [秘] which means secret and hiding along with the ideogram [密] which means confidentiality, density, minutiae, and care. There's not much secret about this word.
See below some sentences, words related to or composed of himitsu:
- Himitsuhojikeiyaku [秘密保持契約] - Confidentiality agreement;
- Secret Door [秘密の扉] - Secret door;
- There is a secret - Existe um segredo;
- Himitsuna kanojou [秘密な彼女] - Secret girlfriend;
- Himitsujanai [It's not a secret] - No secrets;
- Kojintekinahimitsu [個人的な秘密] - Personal secret;
- Kigyouhimitsu [企業秘密] - Corporate secrets; business, industrial, or commercial secrets;
- Secret Disclosure [秘密の暴露] - Secret disclosure;
- Himitsukeisatsu [秘密警察] - Secret police;
- Himitsukessha [秘密結社] - Secret Society;
- Himitsushugi [秘密主義] - Secretism;
- Himitsuyaku [密約] - Secret agreement;

Naisho - For your eyes only
It is also common to use the word naisho [内緒] to refer to some personal secrets, confidences and privacy. The word can also present a circumstance (especially physical) and also inner fulfillment and personal enlightenment.
The expression naishogoto [内緒事] is used to indicate a secret; a private matter or a confidential matter. When we speak or tell a secret, this is called naishohanashi [内緒話], which means secret conversation.
The word naisho [内緒] has a less formal, slightly more personal and temporary touch. Generally, this type of secret is not something to be kept for many years, nor is it something very serious, but that doesn't mean it's for gossiping.
Here are some examples of using the word naisho:
- This is a secret [これは内緒] Please keep this a secret;
- Smoking secretly [内緒でたばこを吸う] - Fumar escondido;
- Secret conversation - [内緒の話] - Secret talk;
- I went there in secret [私は内緒でそこへ行った] - I went there in secret;

Kimitsu - State Secret - Confidential
We also have the formal word kimitsu [機密] used to refer to institutional, governmental, or military secrets. Highly classified and confidential information. It can be used to refer to secret funds, security, and much more.
Below are some examples of usage and compound words with kimitsu:
- Kimitsujouhou [機密情報] - Confidential information;
- Kimitshogo - [機密保護] - Security (of data, s, and others);
- Kokkakimitsu [国家機密] - State secrets; national secret;
- Kimitsuhi [機密費] - Secret funds;
- Kimitsubunsho [機密文書] - Confidential/classified document;
- Kimitsushorui [機密書類] - Classified, confidential, top secret, or sensitive documents;
- Kimitsurouei [機密漏洩] - Leakage of official secrets; leakage of confidential information;
- Tokumukikan [特務機関] - Secret military agency; secret service;
- Gunjikimitsu [軍事機密] - Military secret;

Other secret Japanese words
Who doesn't the character from the anime Hunter x Hunter named Hisoka? Did you know that the word hisoka [密か] is an adjective that means secret, reserved, private, and furtive? Don't these meanings perfectly represent the character's traits?
We also have the word shinpi [神秘] which means mysterious; mystery; secret and sacred mysteries. We also have kakushigoto [隠し事] which means hidden thing or secret. Onmitsu [隠密] is used for hidden, clandestine, covered secrets and spies.
The word hiketsu [秘訣] refers to secrets involving methods and tricks, key codes, mysteries involving art and commerce beyond recipes and tricks. Hiden [秘伝] can also mean secrets of medicine, recipes, and mysteries of art;
- Naibun [内分] - Secret, confidential;
- Shuhigimu [守秘義務] Duty of confidentiality;
- Hitoshirenu [人知れぬ] - Secret; hidden; unnoticed; inward;
- Misokagoto [密か事] - Secret; private matter; love affair; connection;
- Inji [隠事] - Secret (obscure term);
- Naibun [内聞] - Private information; secret;
- Okuyurushi [奥許し] - Segredo, iniciação, diploma;
- Himeyaka [秘めやか] - Secret;
- Shitagokoro [下心] - Secret intention; hidden motive;
- Shiikuretto [シークレット] - From the English secret;
- Gokui [極意] - Deeper secrets (art, skill); mysteries; essence;
- Maruhi [マル秘] = Confidential; secret; regarding the symbol [㊙];
- Uchiuchi [内々] - Secretly; privately; confidentially; within the family circle;
- Hisaku [秘策] - Secret plan; secret scheme; secret strategy; secret method;
- Mitsuji [密事] - Secret matter;
- Kakureru [隠れる] - Hide; encrypt; disappear;

Exposing Secrets in Japanese
Now let's learn words related to revealing secrets and things like that:
- Bakurohanashi [暴露話] - Expose; reveal conversation; internal conversation;
- Tousatsu [盗撮] - Clandestine photography; non-consensual photography; spying photos;
- Netabare [ネタバレ] - Spoiler;
- Touchou [盗聴] - Interception; phone tapping; bug;
- Ashigaderu [足が出る] - Exceed budget; have a secret revealed;
- Gekihaku [激白] - Frankly revealing; revelation; disclosure; confession;
- Kokuhaku [告白] - Confession; acknowledgment; declaration of love; professing feelings;
- Kougai [口外] - Revealer; disclosure; saying; letting out;
- Taneakashi [種明かし] - Reveal how a trick is done; disclosure of a secret; exposure; explanation;
- Tagen [他言] - To tell others; revealing to others;
- Kenshou [顕正] - Revealing the truth; Demonstrating the truth;
- Himitsuroueizai [秘密漏洩罪] - Crime of revealing state secrets; person responsible for revealing them;
- Mitomeru [認める] - Recognize; it; accept;
- Sarakedasu [さらけ出す] - Expose; disclose; unveil; confess;