四し角かく四し面めん

na-adjective, noun which may take the genitive case particle 'no', noun

stiff; formal; prim; square

Describes a person, attitude, or atmosphere that is rigidly formal, humorless, and overly proper. Often used critically.

• 彼かれの四し角かく四し面めんな態たい度どには、みんなうんざりしている。

  Everyone is fed up with his stiff, overly formal attitude.

• 四し角かく四し面めんの挨あい拶さつは抜ぬきにして、気き楽らくに話はなしましょう。

  Let's skip the formal greetings and talk casually.