失しっ敬けい千せん万ばん

na-adjective

extremely rude; outrageously impolite

A strong, formal yojijukugo used to condemn behavior as deeply disrespectful. Often found in written or formal speech.

• 彼かれの失しっ敬けい千せん万ばんな態たい度どには我が慢まんできない。

  I cannot tolerate his outrageously rude attitude.