たいだいし

Meanings

shiku-adjective (archaic)

archaicusually written using kana alone

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.