頑がん固こ一いっ徹てつ

na-adjective, noun

stubborn; obstinate; adamant

A yojijukugo describing someone who is extremely stubborn and unyielding, often with a nuance of being firmly set in one's ways. Used as a noun or adjectival noun.

• 父ちちは頑がん固こ一いっ徹てつで、一いち度ど決きめたことは絶ぜっ対たいに変かえない。

  My father is stubborn and never changes his mind once he has decided something.

• 彼かれの頑がん固こ一いっ徹てつな態たい度どには手てを焼やいている。

  I'm at my wits' end with his obstinate attitude.