na-adjective, noun
impoliteness; carelessness; misconduct; clumsiness
Refers to a lack of social grace, tact, or proper manners, often implying a blunder or thoughtless action. Can also denote general carelessness or clumsiness in behavior.
彼の不調法な発言で場がしらけた。
His tactless remark killed the mood.
不調法を詫びる。
Apologize for one's rudeness.
Compound of 不 (negative prefix) and 調法 (proper method, manners). The exact historical derivation is uncertain, but the word has been used since the Edo period to denote a lack of social grace.