失礼|しつれいshitsurei[2]nakadaka (mid-high)

1. noun, suru verb, intransitive verb, na-adjectivediscourtesy; impoliteness
   あなたはこの前まえの夜よるの失礼しつれいな振る舞ふるまいをスミス夫人ふじんに謝罪しゃざいすべきです。↗

   You should apologize to Mrs. Smith for your rude behavior the other night.
2. expressionexcuse me; goodbye
   「失礼しつれいですが」とアンが話はなしに割わって入はいった。↗

   "Excuse me," Ann broke in.
3. suru verb, transitive verb, intransitive verbto leave
   それではそろそろ失礼しつれいします。↗

   Well, I must be going.
4. suru verb, transitive verb, intransitive verbto be rude
   お返事へんじを書かくのがすごく遅おそくなってしまい、大変たいへん失礼しつれいいたしました。↗

   I'm extremely embarrassed that it has taken so long to reply.

• Synonym無礼ぶれいWrittenWritten/formal prose. An outright lack of courtesy toward anyone, as in 「無礼者」; heavier than 「失礼」 and carrying a tone of rebuke.
• Synonym非礼ひれいWrittenWritten/formal prose for a breach of etiquette, as in 「非礼を詫びる」; used less often than 「失礼」.
• Synonym失敬しっけいCasualColloquial. Covers rudeness and taking leave, as in 「失敬な」 and 「では失敬」 (the latter masculine); also used jokingly for taking something without permission.
• Synonym無作法ぶさほうNeutralUnversed in manners and etiquette, as in 「無作法な食べ方」; the focus is on how one conducts oneself.
• Related傍若無人ぼうじゃくぶじんWrittenA four-character idiom for acting as if no one were around, as in 「傍若無人な振る舞い」.
• Related無骨ぶこつWrittenWritten/formal prose. Rough and unversed in etiquette, as in 「無骨な男」; not necessarily derogatory.
• Related生意気なまいきCasualColloquial. A junior acting big-headed and presumptuous, as in 「生意気な後輩」.
• Related傲慢ごうまんWrittenWritten/formal prose. Arrogance that looks down on others, as in 「傲慢な態度」.
• Related粗野そやNeutralCoarse, vulgar speech or behavior, as in 「粗野な言葉」; stresses vulgarity rather than disrespect.
• Related不躾ぶしつけWrittenWritten/formal prose. Presumptuous or abrupt behavior, as in 「不躾なお願い」; often used in self-deprecating apologies.
• Related僭越せんえつWrittenWritten/formal prose. Overstepping one's station, as in 「僭越ながら」, a humble way to excuse speaking out of turn.
• RelatedちょこざいCasualColloquial. Smart-alecky cheek and arrogance, as in 「猪口才な」; heard mostly in period-drama dialogue.
• Related不埒ふらちFormalFormal written language. Conduct that defies morality, as in 「不埒な奴」; carries strong condemnation.
• Related不行儀ふぎょうぎWrittenWritten/formal prose. Improper behavior, as in 「不行儀な子」; focuses on deportment and manners.
• Related無遠慮ぶえんりょNeutralUtterly unrestrained, as in 「無遠慮な質問」; stresses paying no heed to the other person's feelings.
• Related小賢しいこざかしいCasualColloquial. Smart-alecky and presumptuous, as in 「小賢しい口をきく」.
• RelatedこしゃくCasualColloquial. Cheeky without knowing one's place, as in 「小癪な真似」; said with disdain.
• Related厚顔こうがんWrittenWritten/formal prose. Brazen shamelessness, as in 「厚顔無恥」.
• Related不遜ふそんWrittenWritten/formal prose. Arrogant and insolent, as in 「不遜な態度」.
• Related小生意気こなまいきCasualColloquial. A youngster acting cheeky and full of himself; more contemptuous than 「生意気」.
• Antonym丁寧ていねいNeutralThe opposite of 「失礼」: polite and attentive, as in 「丁寧な言葉遣い」.
• Antonym礼儀正しいれいぎただしいNeutralThe opposite of 「失礼」: well-mannered and courteous, as in 「礼儀正しい青年」; common in both speech and writing.

Use 「失礼」 by default for rudeness or for excusing yourself and leaving. For a heavier, rebuking tone use 「無礼」; for presumptuous requests or apologies 「不躾」 or 「僭越ながら」; for a cheeky junior 「生意気」; for arrogance 「傲慢」 or 「不遜」; for ill-mannered behavior 「無作法」. The opposite quality is 「丁寧」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 礼儀れいぎを失しっすること。無作法ぶさほう。
2. 別わかれること。立ち去たちさること。辞去じきょ。