たいだいし

shiku-adjective (archaic)

improper; unreasonable; outrageous

Archaic shiku adjective describing behavior or attitude that is improper, unreasonable, or outrageous. Not used in modern Japanese; encountered only in classical texts.

• 古こ語ごの「たいだいし」は、振ふる舞まいが不ふ当とうであることを表あらわす。

  The archaic word 'taidaishi' expresses that one's behavior is improper.