| 私 | わたし | I; me | n5 |
| 私たち | わたしたち | we; us | |
| 私立 | しりつ | private (establishment) | n1 |
| 私的 | してき | private; personal | n1 |
| 私事 | しじ | personal affairs; private matter; personal secret; privacy | n1 |
| 私信 | ししん | private letter; personal letter; private message; secret correspondence | n1 |
| 私鉄 | してつ | private railway | |
| 私達 | わたしたち | we; us | |
| 私語 | しご | whispering; private talk; talking (during a class, lecture, etc.) | n2 |
| 私有 | しゆう | private ownership | |
| 私服 | しふく | ordinary clothes (i.e. non-uniform); plain clothes; civilian clothes; casual wear | |
| 私書箱 | ししょばこ | post office box | |
| 私生活 | しせいかつ | private life | n1 |
| 公私 | こうし | public and private matters; official and personal affairs; professional and personal lives | n2 |
| 私心 | ししん | selfishness; selfish motive | n1 |
| 私情 | しじょう | personal feelings; self-interest | n3 |
| 無私 | むし | unselfish; selfless; disinterested | n4 |
| 私用 | しよう | personal use; private use; private business; personal business | n3 |
| 私設 | しせつ | private | n3 |
| 私宅 | したく | private residence or home | |
| 私儀 | わたくしぎ | as for me; I | |
| 私自身 | わたしじしん | myself | |
| 私見 | しけん | personal opinion | n5 |
| 私小説 | ししょうせつ | I-novel; novel narrated in the first person | |
| 私人 | しじん | private individual | |
| 私娼 | ししょう | unlicensed prostitute | n1 |
| 私憤 | しふん | personal grudge | |
| 私生児 | しせいじ | illegitimate child; bastard; love child | |
| 私利 | しり | self-interest; personal profit | n1 |
| 私塾 | しじゅく | small private school (esp. for cramming); private school (in the Edo period, orig. run by Confucianists) | |
| 私慾 | しよく | self-interest; selfish desire | |
| 私室 | ししつ | private room | n1 |
| 私財 | しざい | private funds; own funds; private property | n1 |
| 私淑 | ししゅく | looking up to a person as one's own master or model; being influenced by a person through his works; idolizing | |
| 私邸 | してい | private residence | n3 |
| 私欲 | しよく | self-interest; selfish desire | |
| 私刑 | しけい | punishment without a legal trial; vigilantism | |
| 私する | わたくしする | to use (public property) for personal purposes; to use (e.g. politics) for one's own ends; to misappropriate (public money); to appropriate | |
| 私立大学 | しりつだいがく | private university | |
| 私ども | わたくしども | we; us; I; me | |
| 私議 | しぎ | personal opinion; criticism behind one's back | |
| 私物 | しぶつ | private property; personal belongings; personal effects | n1 |
| 私怨 | しえん | personal grudge; personal enmity | n2 |
| 郵便私書箱 | ゆうびんししょばこ | post office box | |
| 私闘 | しとう | personal struggle | |
| 私益 | しえき | private interests; personal interests | |
| 私大 | しだい | private university | n3 |
| 私腹 | しふく | one's own profits; one's own pockets | |
| 私行 | しこう | personal conduct | n1 |
| 私製 | しせい | privately-made (esp. postcard, mailing card, etc.); commercially-made; non-government; unofficial | n3 |
| 私娼窟 | ししょうくつ | brothel; house of ill repute; red-light district | |
| 私有地 | しゆうち | demesne; estate; private land; private property | |
| 私意 | しい | personal opinion; selfishness | |
| 私蔵 | しぞう | private collection | |
| 私曲 | しきょく | an act done for one's own benefit | |
| 私等 | わしら | we; us | |
| 私通 | しつう | illicit love affair; liaison; fornication; adultery | |
| 私権 | しけん | private right | n5 |
| 私学 | しがく | private (non-governmental) school (college, university) | |
| 私書 | ししょ | private document; personal letter | n2 |
| 私記 | しき | private records or documents | n3 |
| 私家 | しか | private house; one's own house | |
| 私利私欲 | しりしよく | self-interest; selfish desire; greed | |
| 私費 | しひ | private expense | |
| 私立学校 | しりつがっこう | private school; non-government school; independent school | |
| 私法 | しほう | private law | n1 |
| 私共 | わたくしども | we; us; I; me | |
| 滅私 | めっし | selflessness; being unselfish | |
| 私め | わたくしめ | I; me; yours truly | |
| 私印 | しいん | personal seal | |
| 私党 | しとう | faction; band | |
| 私兵 | しへい | private army | |
| 私生子 | しせいし | illegitimate child | |
| 私道 | しどう | private road; driveway | n3 |
| 私家集 | しかしゅう | private or personal collection (of poetry) | |
| 滅私奉公 | めっしほうこう | selfless devotion | |
| 私有財産 | しゆうざいさん | private property | |
| 私領 | しりょう | private land; park | n4 |
| 私案 | しあん | private plan; one's own plan | |
| 私論 | しろん | one's personal opinion or views | |
| 私立大 | しりつだい | private university | |
| 私立高校 | しりつこうこう | private high school | |
| 私家版 | しかばん | privately printed book; private (press) edition | |
| 私営 | しえい | privately operated; private management | |
| 私企業 | しきぎょう | private enterprise | |
| 私立校 | しりつこう | private school | |
| 国公私立 | こっこうしりつ | national, public, and private | |
| 私産 | しさん | private property | n1 |
| 私文書 | しぶんしょ | private document | |
| 私版 | しはん | private printing; privately printed book; private edition; non-government publication | n2 |
| 私募 | しぼ | private offering (of securities); private placement | |
| 私物化 | しぶつか | appropriation; misappropriation; making one's own | |
| 私選弁護人 | しせんべんごにん | private defense counsel | |
| 私撰 | しせん | personal selection (esp. of a defense lawyer); private selection (e.g. of poetry) | n2 |
| 私消 | ししょう | embezzlement; misappropriation of public funds; defalcation | n1 |
| 私書函 | ししょかん | post office box | |
| 私人逮捕 | しじんたいほ | citizen's arrest | |
| 私立中学校 | しりつちゅうがっこう | private junior high school | |
| 私戦 | しせん | private war | n2 |
| 私傷 | ししょう | injury sustained outside official duty; off-duty injury | n1 |
| 私有物 | しゆうぶつ | private possession | |
| 公正無私 | こうせいむし | fair and impartial; just and unselfish | |
| 公私混同 | こうしこんどう | mixing of public and private affairs; mixing business with personal affairs; mixing work and private matters | |
| 国際私法 | こくさいしほう | private international law; conflict of laws | |
| 無私無偏 | むしむへん | to think or act fairly without concern for one's own benefit | |
| 私説 | しせつ | personal opinion | n3 |
| 私ごと | しじ | personal affairs; private matter; personal secret; privacy | n3 |
| 私選 | しせん | personal selection (esp. of a defense lawyer); private selection (e.g. of poetry) | n2 |
| 私供 | わたくしども | we; us; I; me | |
| 私流 | わたしりゅう | one's own style; one's own way (of doing things) | |
| 私募債 | しぼさい | private placement bond; privately-placed bond; privately-subscribed bonds | |
| 則天去私 | そくてんきょし | selfless devotion to justice | |
| 私設秘書 | しせつひしょ | private secretary | |
| 私書箱番号 | ししょばこばんごう | Post Office box address; P.O.box address | |
| 私窠子 | しかし | prostitute; harlot | n5 |
| 私窩子 | しかし | prostitute; harlot | n5 |
| 私寺 | しじ | private temple (ritsuryō period); non-state-sponsored temple | n3 |
| 私生 | しせい | childbirth from an unmarried couple | n3 |
| 私語く | ささやく | to whisper; to murmur; to rumor; to rumour | n2 |
| 私か | ひそか | secret; private; surreptitious | n1 |
| 私地 | しち | private land | n1 |
| 私報 | しほう | secret information; private message | n1 |
| 私考 | しこう | one's own thoughts; one's personal opinion; one's personal view | n1 |
| 私史 | しし | non-official history; privately composed history | |
| 私奴 | わたくしめ | I; me; yours truly | |
| 私宛 | わたしあて | addressed to me; for me | |
| 私徳 | しとく | personal morals; personal virtues | |
| 私恨 | しこん | personal grudge | |
| 私感 | しかん | personal impression | |
| 私注 | しちゅう | personal notes (on a text, etc.); one's annotation | |
| 私田 | しでん | privately owned rice field | |
| 私訴 | しそ | private prosecution; civil suit | |
| 私雨 | わたくしあめ | local rainfall (esp. at the top of a mountain); isolated showers | |
| 一私人 | いちしじん | private individual | |
| 不肖私 | ふしょうわたくし | I; me | |
| 私あて | わたしあて | addressed to me; for me | |
| 私なり | わたしなり | (in) my own way | |
| 私も又 | わたくしもまた | me too; I also | |
| 私ん家 | あたしんち | my home; my family | |
| 私人間 | しじんかん | relations between individuals | |
| 私保険 | しほけん | private insurance | |
| 私奴婢 | しぬひ | privately owned slave | |
| 私好み | わたしごのみ | my kind of; my favorite | |
| 私学校 | しがっこう | private school | |
| 私宛て | わたしあて | addressed to me; for me | |
| 私年号 | しねんごう | era name used by commoners (as opposed to the imperial court); unofficial era name | |
| 私掠船 | しりゃくせん | privateer; corsair | |
| 私法人 | しほうじん | private corporation; private incorporated body | |
| 私的財 | してきざい | private goods | |
| 私立中 | しりつちゅう | private junior high school | |
| 私語り | わたしがたり | first-person narrative | |
| 私費で | しひで | at one's own expense | |
| 私鋳銭 | しちゅうせん | private coinage | |
| 七大私学 | しちだいしがく | seven boarding schools established in Kyoto by noble families during the early Heian period | |
| 公平無私 | こうへいむし | impartiality; fair play | |
| 渉外私法 | しょうがいしほう | private international law; conflict of laws | |
| 無欲無私 | むよくむし | unselfish and impartial (disinterested) | |
| 無私無欲 | むしむよく | selflessness; unselfishness | |
| 私ごのみ | わたしごのみ | my kind of; my favorite | |
| 私利私慾 | しりしよく | self-interest; selfish desire; greed | |
| 私地私民 | しちしみん | private ownership of land and citizens | |
| 私学の雄 | しがくのゆう | one of the leading private schools | |
| 私学助成 | しがくじょせい | subsidization of private schools (subsidisation) | |
| 私怨私欲 | しえんしよく | personal grudges and selfish desires | |
| 私掠免許 | しりゃくめんきょ | letter of marque | |
| 私服刑事 | しふくけいじ | plainclothes police officer; plain-clothes detective | |
| 私服警官 | しふくけいかん | plainclothes police officer | |
| 私的価値 | してきかち | private value | |
| 私的制裁 | してきせいさい | punishment without a legal trial; vigilantism | |
| 私的年金 | してきねんきん | private pension | |
| 私的所有 | してきしょゆう | private ownership; private property | |
| 私的整理 | してきせいり | voluntary liquidation; winding-up | |
| 私的独占 | してきどくせん | private monopolization; private monopoly | |
| 私立探偵 | しりつたんてい | private detective | |
| 私製葉書 | しせいはがき | unofficial postcard; private mailing card | |
| 私設回線 | しせつかいせん | leased line; private circuit; private line | |
| 私道負担 | しどうふたん | portion of a plot of land that is a private road | |
| 私鉄総連 | してつそうれん | General Federation of Private Railway Workers Unions of Japan (abbr) | |
| 仮想私設網 | かそうしせつもう | virtual private network | |
| 私掠免許状 | しりゃくめんきょじょう | letter of marque | |
| 私擬憲法案 | しぎけんぽうあん | private constitutional drafts prepared before the adoption of the Meiji Constitution in 1889 | |
| 私有財産制 | しゆうざいさんせい | private property system; system of private ownership of property; private ownership of the means of production (as the foundation of capitalism) | |
| 私生児出産 | しせいじしゅっさん | illegitimate birth | |
| 私的懇談会 | してきこんだんかい | private consulting group; private panel | |
| 私立学校法 | しりつがっこうほう | Private Schools Act | |
| 私製はがき | しせいはがき | unofficial postcard; private mailing card | |
| 私製ハガキ | しせいはがき | unofficial postcard; private mailing card | |
| 私設応援団 | しせつおうえんだん | private cheer group | |
| 私設領域名 | しせつりょういきめい | private domain name | |
| 私設馬券屋 | しせつばけんや | illegal bookie; unlicensed bookmaker | |
| 国際私法学会 | こくさいしほうがっかい | Private International Law Association of Japan | |
| 日本私法学会 | にっぽんしほうがっかい | Japan Association of Private Law | |
| 私刑を加える | しけいをくわえる | to take the law into one's own hands | |
| 私募ファンド | しぼファンド | private placement fund | |
| 私有財産制度 | しゆうざいさんせいど | private ownership system | |
| 私腹をこやす | しふくをこやす | to fill one's own pocket by taking advantage of a position | |
| 私腹を肥やす | しふくをこやす | to fill one's own pocket by taking advantage of a position | |
| 私設管理領域 | しせつかんりりょういき | Private Management Domain; PRMD | |
| 仮想私設通信網 | かそうしせつつうしんもう | VPN; Virtual Private Network | |
| 日本私学振興財団 | にっぽんしがくしんこうざいだん | Japan Private School Promotion Foundation | |
| 日本私立大学協会 | にっぽんしりつだいがくきょうかい | Association of Private Universities of Japan | |
| 私戦予備及び陰謀罪 | しせんよびおよびいんぼうざい | (crime of) preparations or plots for private war | |
| 日本私立歯科大学協会 | にっぽんしりつしかだいがくきょうかい | Japanese Association of Private Dental Schools | |
| 日本私立短期大学協会 | にっぽんしりつたんきだいがくきょうかい | Association of Private Junior Colleges in Japan | |
| 私立大学情報教育協会 | しりつだいがくじょうほうきょういくきょうかい | Japan Universities Association for Computer Education | |
| 私立学校教職員共済組合 | しりつがっこうきょうしょくいんきょうさいくみあい | Mutual Aid Association of Private School Personnel | |
| 私設ディレクトリ管理領域 | しせつディレクトリかんりりょういき | Private Directory Management Domain; PRDMD | |