Everyone was surprised by his rude question.
ぶしつけなお願いで恐縮ですが、少々お時間をいただけますか。
I apologize for the blunt request, but could you spare me a moment?
失礼 is a more general term for rudeness or impoliteness, often used in formal apologies. 不躾 specifically implies a lack of proper upbringing or tact, and can sound more personal or judgmental.
無礼 is a stronger, more direct word for insolence or disrespect, often used for intentional rudeness. 不躾 can also imply a lack of social grace rather than deliberate offense.
Standard kanji spelling.
Kana spelling is common in everyday writing.
Rarely used kanji form.
Rarely used kanji form.
The word is composed of 不 (negative prefix) and 躾 (discipline, upbringing). The kanji 躾 is a kokuji (Japanese-made character) combining 身 (body) and 美 (beauty), suggesting the cultivation of proper behavior. The exact historical derivation is uncertain, but the term literally means 'not properly brought up'.